Falling ladders - why does this happen?

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11. 01. 2023





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cicalinarrot Před 16 dny
Plot twist: he has no idea why that happened and he's genuinely asking, hoping that someone tells him in the comment.
Body Rum UAE
Body Rum UAE Před 7 dny
Bunch of spanners on here. @Wet Doggo "seems like you're butthurt about a joke 😅 sry about that" Assumptions are for people with poor reasoning skills. @Marvin Mestanza Oh, but you see, Alec's got the mechanical engineering, so no other engineers could possibly comprehend geometry.
gourdo2 Před 9 dny
The ladder rungs are offset diagonally and it turns out this matters. When the lower side of the rung hits the hard surface, it bounces up a bit, forcing the higher end of the rigid rung to be accelerated down. Since the rope on the lower end is slack as it bounces up, it doesn't affect the ladder, but the higher end of the rung has tension, so its rope is pulled down slightly. On the next rung, the same thing happens, but now the offset goes the other way, so the other rope is pulled down. In this fashion, each rope is being tugged down in an alternating fashion, resulting in a faster descent. In essence, the up bounce provides energy that speeds up the rate of descent of the ladder versus a ladder that is purely falling.
Yemen1976 MotherlandTuff
cuz every time a step hits the table it causes a jerk like a yank pulling down the ones above
Wubba Lubba dub dub
They fall at the same rate but the one on the right is airborne for longer and has a longer fall so then it takes longer for it to hit the ground.
Overlord Před 9 dny
Andrei Filip
Andrei Filip Před 5 dny
It's mostly the slanted thingies. As they fall, they change position going to fully horizontal. That makes them pull down slightly more on the formerly higher side, in turn pulling the next one and that will pull more on the other side, thus keeping it from veering off course. 2 good counter experiments would be to do the same thing with two ladders with normal, horizontal steps and two with inclined ones, but all in the same direction (or just the 2 normal ones again but hold one side higher up I guess..)
Bayhuntr Před 4 dny
Every time the low end of a rod hits the table it gives a slight tug downward on the other end, transferring stopping force to downward force. This speeds up the velocity of a chain ladder.
Maximus Chapman
Maximus Chapman Před 3 hodinami
Galahad Před 7 hodinami
i thought the exact same thing, don't know if it's correct tho.
mikalnolan _
mikalnolan _ Před 2 dny
this is answer is explained correctly in the most simplest of terminology
J Y Před 4 dny
Angle matters. As one end of the stick hits the table , it bounces a bit, which results the other end to "pull". This then happens alternatively on both sides.
6+1 the cat
6+1 the cat Před 3 hodinami
i was gonna say this in the comments but ehh same thing
AppFzx Před 4 hodinami
Nailed it. Even if they were horizontal, the strike would apply spin to the ladder rung and add a downward tug.
G@rfielD Před 4 hodinami
Это происходит потому, что после столкновения нижнего конца со столом, верхний конец пытается двигаться по окружности, с центром в точке столкновения нижнего конца со столом, и радиусом, равным длине ступени. При этом вектор движения меняется. Если до этого всë двигалось строго вниз, то после столкновения вниз и в сторону. Пытаясь сохранить ускорение, верхний конец отклоняется от траектории нижнего конца следующей ступени и увлекает еë за собой, натягивая струну и ускоряя всю конструкцию.
Georg Před 20 hodinami
i'm still wondering if it depends on the bounce or stopping (even slowing) is enough
Greg Hunter
Greg Hunter Před 4 dny
I remember talking about the dynamics of chains and ropes with Prof Ruina over 25 years ago. Thanks for the memory.
hefty lad
hefty lad Před 8 dny
For those wondering, you see how the rods are alternating diagonal? When the downward part of the bottom rod hits the table, it bounces up, pulling the other side of the rod, and therefore that rope, downwards. Rinse and repeat with every rod, all pulling slightly downwards on the ladder, and now it's falling faster than the other.
Tarioth Před 7 dny
Had the same thought on the second playthrough.
knut riis
knut riis Před 7 dny
@Tomek Stec Try it - one rod will show you how it works.
Korrie Turner
Korrie Turner Před 7 dny
U S Před 7 dny
_ hypergamy
_ hypergamy Před 7 dny
@owosturm the chances are very likely I think. Every time the lower side of the pole hits the table, it forces the other side to try and equalise it’s centre of gravity, which in turn pulls the ladder marginally quicker. Where as the other ladder is in free fall and will not gain kinetic momentum because it’s stagnant, very much lost in motion
fighting2succeed Před 2 dny
When a rung hits the table on one end, it causes the other side of the rung to accelerate ever so slightly. it gets compounded for each rung until it's very easy to see it has fallen faster than the one in complete free fall.
Professor Hulk
Professor Hulk Před 4 dny
Energy is transfered back into the "system" accelerating the object on the left. Because the chain ladders are configured in such a way, energy transfer takes place when the ladder hits the table. This happens as the ladder hits the table because each rod becomes parallel to the table. The distance that each rod moves to become parallel to the table makes up the added acceleration by pulling the ladder downward. Again, this pulling adds additional acceleration.
Patrick Robichaux
Some rungs don't hit perfectly on center, causing movement in the y axis if the x axis is parallel to the rungs on the ladder. The force of gravity going straight down remains constant, but the pull on the y axis causes an addition downward force.
Dillsfawn Před 3 dny
My guess is that the one that hits the table has less surface area to fight against air resistance due to parts of it coming to rest on the table. Since the other one still has a large part of it mid air, and thus resisting the air as it falls, it falls slower.
Electro462 Před 6 hodinami
Yes I agree, Point B also stopped on a surface way sooner than point A so therefore Point B is the winner 😎
G Curious
G Curious Před 8 dny
A key to this trick is the alternating slanted bars. One end of a bar hitting the table causes the other end to pull the short string due to the rotation around the center of gravity of the bar. The short string is pulled and in turn the next bar is pulled slightly. As a result, the ladder experiences more pull (downward force) compared with the other ladder.
Tony Rule
Tony Rule Před 3 dny
@The Unknown It only needs to pull one side to put a force on the entire assembly. You can see it happening if you go frame-by-frame on the video - pause it and use the comma and period key to advance and rewind one frame respectively. You can see exactly what the OP and I described occurring.
The Unknown
The Unknown Před 3 dny
@Tony Rule exactly what I said am I wrong
Tony Rule
Tony Rule Před 3 dny
@D Ziggy *_" the spin will cause yanks against the taught section..."_* *Taut. But, yes, that can also be a factor, but is not the primary one. It relies on the short string being in tension at some point after the rung contacts the pile, in order to transmit that additional accelerating force.
Tony Rule
Tony Rule Před 3 dny
@The Unknown No, my 'theory' does not rely on that at all. Quite the opposite - it requires the connection only allowing tension, not compression.
The Unknown
The Unknown Před 3 dny
​@Tony Rule your theory would mean that the ropes are solid that break under compression but they are still a soft connect not a hard connect so now the center of gravity is a rotation point so every pull it will only pull that side down in return the opposite and equal reaction is the other side coming back up
Demond Ellis
Demond Ellis Před 4 dny
This is likely a demonstration of the "parachute effect," where a falling object that is able to spread out or collapse upon impact will fall faster than an object that remains rigid. The ladder that collapses upon the table is able to present a larger surface area to the air, creating more drag and allowing it to fall faster. The ladder that avoids the table and continues to the floor maintains its rigidity and falls at a slower rate.
Aryan Bhajanka
Aryan Bhajanka Před dnem
When the ladder hits the table, the strings become loose due to which tension force becomes 0. Therefore there is no pulling force acting on the ladder after it hits the table however it does on the ladder which is free falling.
Rithvik Kuttin
Rithvik Kuttin Před dnem
Look at this: when the ladder hits the table, the ropes connecting the rods get stretched into a "u" like shape facing the surface of the wall. So the force given by the rope pulls the upper rods one by one giving it more pull and in this manner the ladder falls quicker.
Arthur Tipaldi
Arthur Tipaldi Před 2 dny
My guess is that it all goes down the the fact that the bars are inclined, explanations below for those interested ⬇️ When a bar hits the table, the hitting side comes to a sudden stop, creating an acceleration of the other side to compensate. This acceleration pulls on the string, thus accelerating the falling of the ladder... that's it! :)
Mike Curtis
Mike Curtis Před 12 dny
Since the rungs are angled, the table is causing them to flatten out, which pulls down on the rung above it. This alternates left to right, gradually speeding it up. Edit: Never expected my comment to get so much attention. To elaborate a bit, one needs to understand that even the ladder on the right will speed up after it hits the ground, just like the one on the left. The only reason you see the difference is because the one on the left hit the table (higher ground) before the one on the right. Also, to better see the pulling effect, don't just watch the strings close to the table. Look closer to the top of the ladder, like two or three rungs from the top after the top comes into view. You can clearly see motion in the strings that is not seen in the ladder on the right.
Mike Curtis
Mike Curtis Před dnem
@TheUnorthodoxy so you're trying to say the table increases gravity on the left, and therefore makes the ladder fall faster? You really think the difference would be enough to be seen in the video? If that was the case, the ladder on the right would be pulled towards the one on the left. Before responding, watch the video again. Look at the rungs of the ladder near the top. You can clearly see rotational forces being applied to the rungs well before they hit the table. This motion is not seen in the ladder on the right, because it hasn't hit the ground yet.
TheUnorthodoxy Před dnem
@Mike Curtis even if they do not fall yo the ground that is irrelevant. The table still has a mass greater than the surrounding area, this distorts (draws closer) the mass of the other object Ladder A. Each ring incrementally increases the speed of the ladder A being drawn towards the centre of mass of the table (which does exist unlike the ground you made reference to). This is space-time (aka temporal time), this changes the perception of speed and direction as time is the only metric we have for movement, without time there is no movement and thus no attraction and thus no gravity. Time is what is changing our perspective here from our reference point the Ladder A speeds up, it increases its attraction to the table more than Ladder B towards the earth. (This experiment was done on earth right @Mike Curtis ?) Everything with mass has an attraction that attraction we call gravity. Therefore apples do not fall to earth if thrown horizontally, they are drawn TO earth by the attraction between their masses, the apple being smaller in size and mass is overpowered by earth's mass and pull measured as 1G. As the apple travels (time) the apple curves from our reference frame but from the apples it is still travelling in a straight-line we threw it on. Time incrementally curves the apple towards the earth's massive pull (gravity) without time the apple would not travel and would not fall to earth. Where's your explanation?
Mike Curtis
Mike Curtis Před dnem
@Lookup VeraZhou is the "also" meant to suggest my comment was copied and pasted?
Mike Curtis
Mike Curtis Před dnem
@TheUnorthodoxy what you're not understanding is the one on the right will also speed up just like the one on the left.... ONCE IT HITS THE GROUND. The only reason the one on the left speeds up first is because it hits the table (or higher ground) first.
Mike Curtis
Mike Curtis Před dnem
@Cody Elliott the egg and paperclip would only fall at the exact speed in a vacuum
Carlos R. Esposito
Here is your answer: In his experiment, Professor Ruina used chain ladders, which have links connecting the rungs rather than a solid structure. He found that when the ladders were dropped simultaneously, one ladder fell faster than the other due to a phenomenon called "ladder kinematic asymmetry." The reason for this asymmetry is that in the ladder one side is longer than the other, which causes one side of the ladder to fall faster than the other. This effect is due to the ladder's geometry, and the way in which the ladder's links are connected, which creates an imbalance in the ladder's center of mass. It's important to note that the ladders in the experiment of Professor Ruina are not in a free fall state as the ladder falls its links move and bend with the ladder, creating a different dynamic than a free fall state. Also, this experiment is not representative of rope ladders, but of a specific type of ladder.
Talisman Skulls
Talisman Skulls Před 3 dny
You can see already the one with the table, right off ,(B) is increasing velocity slightly the moment it makes contact because of less mass resistance to the tensile force as it ca lapses. The one containing to free fall maintains the same mass and tensile force more or less. If they were not angled it would still have the same results because the free falling one hasn't collapsed. Did this experiment 0ver 20 some years ago when school actually still had some use.
aleksander suur
aleksander suur Před dnem
You can see it when you look at the strings for the ladder on left. Every time a peg hits the table, it rotates around it's center of mass, tugging the opposite string down just a bit.
Delanor Rosey
Delanor Rosey Před 4 dny
Simply put - as the ladder lands on the table, the gravitational forces being used to pull the ladder down are transferred to the remaining of the ladder that has yet to fall. So it falls faster than a free-falling ladder. The only way the free-falling ladder will beat the ladder being dropped onto a table is if that ladder is dropped from a much higher height and is allowed to reach Terminal Velocity.
Kaelen Anderson
Kaelen Anderson Před 9 dny
This happens because each rung on the ladder is tilted. As each rung hits the table it pulls the string it's attached to downward a bit, causing the ladder to fall faster.
J. A
J. A Před 5 dny
probably the best explanation
Derek Stocker
Derek Stocker Před 5 dny
Thanks for that but I am still surprised!
El Chingy
El Chingy Před 5 dny
Abhishek Mohanan
Abhishek Mohanan Před 6 dny
@John Doe tht is not how it works bro
Aaron Barlow
Aaron Barlow Před 6 dny
@John Doe The left one hits the table far earlier. The right ladder probably doesn't even hit the floor by the time the left ladder has fully collapsed. Surely you're not this stupid, are you trolling?
Victor Perez
Victor Perez Před dnem
I think it has to do with inertia and how energy is distributed. When the ladder hits the floor, the downward force is pushed back up to the top of the ladder. Once it reaches the top of the ladder, the force begins moving back down ladder. How a slinky can compress and contract.
Tamlyn Burleigh
Tamlyn Burleigh Před dnem
I love this sort of puzzle. Thanks. I think you need to look closely at the point of impact. The rung hits the table and swerves or rotates away from the point of contact. This is probably the key.
Illuminate Taw
Illuminate Taw Před dnem
Because of the loss of weight that occurs when hitting the table, which leads to the loss of tension on the rope, so the distance between the stairs decreases, which makes it appear that he is falling faster, but both of them are falling at the same speed in fact.
Mobbs Před 4 dny
Never seen a ladder like that, so I assume it's relevant to the experiment. As many others have stated, the rotational force applied to each rung as it hits the desk pulls on the shorter end of the rope, in turn pulling the whole thing down faster. Right just has the force of gravity and a bit of air resistance. Left has the force of the desk pushing back on it, so, we see a reaction
Mark Whittaker
Mark Whittaker Před 13 dny
It is because of the angled rungs. When the lower end of the rung hits the table, the rung pivots to level out. This applies a downward force on the string accelerating that side of the ladder down. This happens with each rung.
Jan K
Jan K Před 9 dny
@FWU - Finally Waking Up than give your take on this, choosen one. Have you payed your speeding tickets yet?
mauze king
mauze king Před 10 dny
@FWU - Finally Waking Up yep why didn't I think of that. Nobel Prize for you.
FWU - Finally Waking Up
@Brendan guys guys guys it has nothing to do with tension or shape or any of that think of it like this it doesn't matter about the beginning of the ladder it's about the end of the ladder the end of the ladder is landing earlier on one side because its destination for landing is cut in half and has a shorter distance so it's going to land sooner obviously it's the same thing like measuring the top of ladder a and it's going to land hypothetically it would land at the around the same time that be would if you watch the video
FWU - Finally Waking Up
@mauze king seriously what's wrong with all of you the reason why one land sooner than the other is because it's Landing distance is shorter there's no other reason it's obviously a child could figure it out I predicted it before before I even play the video
FWU - Finally Waking Up
@Jan K it's not air resistance smh. What's wrong with all of you that don't see the simple obvious reason why one lands first than the other?
Joey Garza
Joey Garza Před 3 dny
The ladder hitting the table and forming a "mass" was pulling the ladder towards it at a faster rate due to its massive, gravitational pull, whereas the freefalling ladder was not able to "build up mass" and hence a stronger, faster pull, and so continues to fall with its speed uninterrupted.
Matt #
Matt # Před 3 dny
The strings on A have an additional tensile force applied to them when each rung falls out of axis. This is known as linear refractal preclusion, or LRP. It’s much to the same affect as when you randomly make something up on a CS-vid video comment.
Spencer Teolis
Spencer Teolis Před dnem
I think the torque caused by the angled rungs is part of it but the other part is that the contact height of each subsequent rung is going up. If that wasn’t happening there would nothing causing the high end of the rung to move any faster than it was already going.
Nicholas Hernandez
I was genuinely surprised. Thought it would be even. Now I’m mildly intrigued. Thank you for that. Shows me there is still innocent magic in the world.
SniperShor Před 13 dny
The ladder's steps are not parallel. And they have a specific pattern. When one step of the ladder hits the floor, it creates an unbalanced force on the step, which produces a torque that pulls the upcoming step downward. The addition of force, say torque in this case, helps the ladder's top cap fall faster than the freely falling ladder.
ismael cm
ismael cm Před 7 dny
@M You see the mote in your brother's eye, but do not see the beam in your own eye.
M Před 8 dny
@ismael cm your ignorance harms no one, but only you.
ismael cm
ismael cm Před 8 dny
@M Hahahahah, still no answers to simple questions and now you say I'm wrong but you won't say what's wrong because of how I am writing. Hahaha. Nice try little man, it's okay, don't worry, you can go, I won't hold a grudge against you. Keep learning physics, maybe one day you'll understand, it's okay. I wish you luck with your high school exams.
phil ip
phil ip Před 9 dny
@Didi Dogster thank you very much
M Před 9 dny
@ismael cm It is clear that you don't understand physics. And I won't even try to explain what mistakes are you making, because you are an ignorant and dumb ass with huge ego, who will never try to understand own mistakes.
Kingshuk Guha
Kingshuk Guha Před 2 dny
It is observed that after the stick has hit the table , both the ladders continue to fall at same speed till the accumulating sticks starts falling from the edge of the table , adding a extra pull force on the string , resulting in ladder falling faster than the free falling one.
Isaac Holzwarth
Isaac Holzwarth Před 5 dny
My initial guess is that the more of the ladder that isn't moving the less air resistance is being experienced as a whole, so the other parts begin to fall faster. The other idea is that when the ladders are held up by the top the strings are in tension, with the bottom rings "pulling" on the rungs above. So when the pieces hit the table and that tension is relieved that tension/stored energy is transferred to the rung above, pulling it down a little faster, and every rung that hits does the same.
Roger Nohr
Roger Nohr Před dnem
When a peg on the ladder hits a peg that is already there, it is sent flying to either side or hits perfectly on top of the peg. Either way, there is a good chance that the rope is yanked in either direction; both directions will have roughly equal pull on the rope, both resulting in the whole ladder being yanked down, bit by bit.
Martin Rößner
Martin Rößner Před dnem
The free falling ladder still had the same air resistance while the landing one had less and less air resistance the more steps stopped moving.
Binyamin Friedman
Binyamin Friedman Před 12 dny
As each rung hits the bottom, it creates a small moment of inertia (rotation) because one end of the rung lands first and then bounces up. When that end bounces up, it causes a slight downward tug on the other end (the side with the short string), which is still taut. This additional force causes a slightly greater acceleration to the free-falling object above.
Radwan M. Kassir
Radwan M. Kassir Před 10 dny
The air drag on the ladder falling on the table is getting less since its surface area moving through the air is getting less and less, which makes it fall faster (air drag is getting reduced).
Kirk Johnson
Kirk Johnson Před 12 dny
@noon neel No, it had never occurred to me to even consider such a situation. I suspect a similar string ladder but with parallel rungs would in fact do the same thing IF it was long enough, but only because some minor imperfection in the system would cause a rung to hit on one end before the other and that would start a chain reaction.
noon neel
noon neel Před 12 dny
@Kirk Johnson see i agree with what you said ,but tell me did you ever imagine that phenomena before looking at this experiment video??? your reasoning is accurate ,but if the phenomena goes true for parallel rungs. i mean logically you and i both know it wont happen ,but i personally did not do the experiment so.... iam holding back
Kirk Johnson
Kirk Johnson Před 12 dny
If you pause the video right after each impact, you will notice that after each impact, there is an instant where the short string to the rung above is in tension while the long string is slack. This would appear to confirm your analysis of the problem.
Kirk Johnson
Kirk Johnson Před 12 dny
​@noon neel No, the end that hits first experiences an upward force from the table which causes the rung to rotate ever so slightly about its center causing a tension on the opposite string and that tension pulls down on the opposite end of the rung above causing it to accelerate downward and to rotationally accelerate creating tension on the opposite string and so on and so on.
Andrew Nash
Andrew Nash Před 5 dny
If you watch closely the one that hits the table falls off the table after that. I would assume that it falls off the table at a faster speed than when it was first dropped. This probably happens because it rolls off the table at the speed at which the Earth is spinning which is faster than the free falling one on the right. My advice is use more cameras next time.
Mystical_Zeus Před 4 dny
This is my hypothesis: When the ladder hits the table the energy pulling it down no longer remains constant and the stored energy from free fall gets transferred to smaller and smaller and therefore lighter and lighter sections gains speed due to the same amount of energy being transferred into a smaller and smaller object. This is the one I believe to be true. You may see the right ladder accelerate once it's also hitting the ground. This is why the two ladders are the same but oppositely opposed as to see where ends meet and this way you can tell when the left ladder starts accelerating. I have 0 idea why the ladder steps are slanted and am curious because there is something to it as making a traditional ladder would've been easier.
Delta de Dirac
Delta de Dirac Před 2 dny
I think it's because of the air friction, that slows down both ladders. But since the left one (B) has less and less parts remaining (hanging in the air) the overall friction force getting smaller and hence the increased speed of fall. I suppose in vacuum both ladders would have fallen at the same speed.
Nader Nader
Nader Nader Před 2 hodinami
As the left ladder hits there is a reflection of the “wave” which does not happen with the free falling ladder. The upward reflection of the wave, which creates rarefactions compresses the ladder and makes it reach the position in question faster than the other ladder.
Eduardo Loureiro Gomes
Due to the angle of each section, when it hits the table, it pulls the other side which is attached through the cable to the next section. The angular energy is transfered each time one side hits the table.
David Scott
David Scott Před 3 dny
@SnotrocketLT4 Edit 1: you are correct. Edit 2: the only limit would be wind resistance which would cause it to reach terminal velocity pretty quickly.
David Scott
David Scott Před 3 dny
@Enrico Caminiti That would require zero external forces and some net positive internal forces from something like a spring being released. So that won’t work in this type of situation.
Yuko Před 7 dny
@moon house kinetic movement or force when it’s stopped?
moon house
moon house Před 10 dny
@kylethekidable yeah I realized this shortly after commenting. I was thinking they could have demonstrated the same effect without the need for a table by using one ladder with staggered rungs and one ladder with parallel rungs. However, I cheated and looked up the experiment, and while they don’t say so explicitly, they may have had a good reason not to do it this way. In order to demonstrate that there was nothing special about the ladder in the left in particular, they ran the experiment again but with the ladders switched and got the same results. This wouldn’t have been possible using a staggered ladder, a parallel ladder and no table.
Phillip Young
Phillip Young Před 11 dny
This is definitely correct, also I think the rungs glancing off each other and pulling sideways (toward and away from the camera in this clip) is also adding a component to the tensions in the cables
Nick Rombach
Nick Rombach Před 3 dny
Sir Isaac Newton would have thrived here. Equations of motion differ for each system, as does the relative amount of distance traveled. While the rate of change of speed may be initially equal (gravity is a constant acceleration), the relatively shorter amount of distance traveled in scenario B allows the tension in the ropes to do work on system B. Ground-induced work creates an impulse of kinetic energy for system B, specifically as it relates to increasing the acceleration of the falling system. First law, object in motion remains in motion--freefall. Second law postulates that an acceleration is present when the tension in the rope (a force) interacts with the mass of the table, and the mass of the system (ropes + wood). Third law postulates that the reaction of system B interacting with the table yields an equal and opposite reaction, which propagates force up the taut rope (speed depends on rope tension and wood stiffness) providing the apparent acceleration of system B (i.e., the rate of change of speed of system B). There is no external acceleration acting on system A (besides the acceleration due to gravity). Could also say the ropes in system A never experience a significant change in tension throughout the amount of distance traveled.
May be because of the inclination of the steps of the ladder. When one side of each step of ladder touches the table the other side creates a pulling momentum to the strings and it accelerates the speed of the fall compared to the second ladder. This will not happen if the steps were tied horizontally !
fameasser123 Před 5 dny
The ladder on the left finishes landing first because the table is high than the floor and once the falling rungs stop and land on each other the point where the ladder has to stop falling gets higher and higher while the floor stays at the same height so the ladder on the right has farther to fall.
Anant Bhasu
Anant Bhasu Před dnem
The free falling ladder continued getting the same friction since the surface area exposed did not change. The one hitting the table suffered lesser friction due to its diminishing surface area.
Sapphire Spire
Sapphire Spire Před 12 dny
Because the rungs are tilted. When the rungs hit the table, they want to lay flat, but they have to rotate first, and that angular momentum pulls down on the shorter strings, which pulls the ladder down faster.
Autova Před hodinou
​@mr.guydude7413 judging from your perfect text, I bet people are saying you are a stuff knower. It's so natural, it's like a talent you have.
futureboy Před 3 dny
This is a very good explanation - I specifically like "they want to lay flat, but they have to rotate first".
Madikal Doktor
Madikal Doktor Před 6 dny
Logical ... I conclude ... live long and prosper 🖖🏻.
ThePrufessa Před 7 dny
@KingsBlade 7 no. That.
KingsBlade 7
KingsBlade 7 Před 7 dny
Yes. This.
Czeckie Před 2 dny
for me the most surprising thing to me is how the ladders stayed so orderly in line and haven't collided
Dalal M
Dalal M Před 3 dny
When the ladder hits the table, a force in the opposite direction will start and then go back and fasten the rate of the fall. Kinda like a spring mechanism
Justin Allott
Justin Allott Před 5 dny
Newtons law, opposite but equal reaction; When a rung hits the table, it is bounced back up slightly by the stopping force, as the rung then bounces off the table, a slight amount of extra force is pulled on the ropes to the next rung (as not only gravity it pulling on the next rung, but a slight tug from the proceeding rung that has bounced is now also applying a tiny amount of force due to the “whipping” action on the ropes). Though the many number of rungs that are performing these actions, an exponential fall rate can be observed over time.
管偉凡 Před 4 dny
Also, it’s a little bit tricky to say “both ladders were dropped at the same time”: were they folded up, and the last rung being released first? That way, the tension on the string will be stronger on the right because the bottom rung without hitting the table continue to fall quicker.
Timo Kreuzer
Timo Kreuzer Před 10 dny
The steps are tilted, so once the lower side hits the table, it will act as a lever, pulling on the above step at the opposite side. Since the tilt is alternating, this extra pull will be alternating between left and right, so on average both sides get a little extra pull down.
uday raj
uday raj Před 10 dny
@Reellron well thats one way to say the same thing with different words
William1987GTA1 Před 10 dny
​@Farhad Kabir Great comment John Fetterman.
emmac Před 10 dny
@Kyle Mullaney and you're right too, it could also be a combination of many different forces for the overall effect. I guess you would have to do a different test and change variables
Ben Marolt
Ben Marolt Před 10 dny
​@emmac You are saying you would accelerate beyond terminal velocity in what circumstance? Have you invented a new definition or terminal velocity?
emmac Před 10 dny
​@Kyle Mullaney and another question I have, you notice the rungs are only pulled by each others strings, there is slack in the lines for every rung after it lands
Jordan Marsh
Jordan Marsh Před 2 dny
With the angle of the bottom step making contact first, it acts with slight leverage pulling on the opposite side with short string. Over time those small adjustments made it slightly speed up. Since that ladder made contact first it made it seem faster than the other ladder… but that’s just a guess.
Animus Před 2 dny
The ladder rungs are the reason for this. When the lower side of the rung hits the table, it causes the higher side of the rung to pull the short rope down faster. Forcing the whole chain to speed up.
Vartazian360 Před dnem
You can see if you watch closely its because dropping something with a string at an angle causes tension caused from the extra force pulling down after the impact.. The tension works its way up the ladder until it pulls the top portion down
bumpty Před 3 dny
Slanted rungs causing a tug on the higher line when the low end hits the table, so each time a rung lands it's providing an impulse downward.
futureboy Před 5 dny
It's because the rungs are angled. When the lower end of a rung hits, the downward momentum of the entire rung is turned into a rotational force on the rung which pulls the higher end down and therefore the rest of the ladder down a bit faster.
shrimpjar2 Před 7 hodinami
@Local Maple that's basically what I said, because just like the physics of a bouncing ball when it hits, it turns the potential energy to kinetic energy and jerks the strings down. Great explanation, finally!
Matt Bennett
Matt Bennett Před 10 hodinami
well said
Local Maple
Local Maple Před 11 hodinami
I would add that the cords were taut, and landing with a jerk/bounce pulled them a bit.
Leland R.
Leland R. Před 13 hodinami
pls dumb it down I’m stupid
shrimpjar2 Před 15 hodinami
@Microcephaly Prank Gone Sexual The original poster is just arguing with people in the comments that they're wrong because they don't understand his poor explaining
Chris Stone
Chris Stone Před dnem
My guess is that the impact of the left ladder hitting the table is traveling up the ladder itself. The "shockwave" of the impact is causing the left ladder to contract in addition to being pulled down by gravity.
Jamers Bazuka
Jamers Bazuka Před 2 dny
Is it conservation of momentum? I think the angled rungs make it so that when one end stops, that rung keeps the momentum until the other side hits, speeding up that still-falling end ever so slightly. In other words, if in free-fall a stick has x momentum, and one half of a stick abruptly stops while the other half is free to keep going, the still-moving half would have to double its speed to maintain its momentum.
Ice fox
Ice fox Před 8 hodinami
My theory is that the weight increased so the one that hit the table had more gravity pull that the other that's why a car will weight less at different speeds
It's Related to Minecraft
The ladders are connected with a string so when the first side of the angled step hit the table, it produced an opposite energy for the other side to pull the strings more towards the table as well.
I love the part where he explains why it happens
Val A
Val A Před 4 dny
@Toby Bearman In vacuum. So, the shorter ladder will have less resistance, and that's why it will fall faster.
vid dumpie
vid dumpie Před 9 dny
The magic is the angle of the ladder steps. Look at the pivot impact and the tension and the length of string and it should add up why.
TandemRBLX Před 9 dny
@Alex bros mad the youtuber asked a question💀💀
Kris Netemeyer
Kris Netemeyer Před 9 dny
@srejuboyd hahah how orignal
srejuboyd Před 9 dny
​@Kris Netemeyer that joke went so far over your head that nasa could have attached a space probe to it for a free trip to pluto
Dave McCall
Dave McCall Před 5 dny
The one on the left creates rotational acceleration on impact, each rod rotates creating tension in the string upward dragging down the rods. The added acceleration downward is equal to the sum of each rods contribution of rotational acceleration.
Sahil Dicaprio
Sahil Dicaprio Před 2 dny
So, if the rods were straight, they would fall at the same rate, right?
urielxd Před 2 dny
Air ressistance, the one that hit the table has no ressistance after it hits, the other has more air resistance when is in free fall, and inclussive the form of the conection of the steps, it generates an acceleration by momentum, you can see that interacrion in the top step of the ladder
Hoggwar Před 3 dny
Элементарно, палки разделены не одинаковой длины веревками. Поэтому, эта палка ударяясь о стол, слегка тянет свой второй конец. А так как этих палок не мало, в сумме, получается быстрее
Minecraft Před hodinou
Well According to me,if you notice carefully you will notice that when ladder B is falling it is stacking on top of each other giving the stick or whatever you call it less distance to cover while the ladder A sticks have to cover the same distance unlike Ladder B Pls don't judge if I am wrong....
YT775 Před 13 dny
The angled ladder rungs are forced to rotate around their center of mass when one end hits the table, this minor rotation slightly pulls on the cord on the adjacent end. So in sum a slight downward force along the cords is applied. In conclusion this only works if the rungs are angled like this.
Bill Johnston
Bill Johnston Před 11 dny
@jpteknoman mechanical physics baffled me in school but nuclear physics I mastered so I’m unlikely to be correct in this situation. But if one was to increase the distances from inches to feet it stands reason that air resistance would likely have an effect that can be readily seen in such a demonstration. Please, someone explain why air resistance wouldn’t explain this phenomenon.
Alec Warda
Alec Warda Před 12 dny
@MrJeffrey938 likewise my friend
stinbray 11
stinbray 11 Před 12 dny
@Motorsport Creative ok? And y was this necessary. What does this add to society does it make u feel better about ur menial life
sloth-e Před 13 dny
@YT775 my pleasure. Translators are still very flawed for many languages. 👍
MrJeffrey938 Před 13 dny
@Alec Warda Same here. Thanks for keeping me on my toes.
Kasra Rasaee
Kasra Rasaee Před 12 hodinami
The upward motion of the connected lines between each step creates marginal differential upward motion which then effects the higher steps. The kinetic energy is transferred through the lines upward. Further, perhaps the angle of the steps also contributes, increasing the kinetic energy, but not sure, just an intuition.
Cosme Alcantar
Cosme Alcantar Před 4 dny
I love experiments like this I actually question random questions that almost nobody asks. Or I am probably feeling their thoughts because I have no idea why these thoughts and ideas come to me at the exact same time it's in process. Or maybe I am related or agree with people like this and perhaps they have the answer with trials and errors.
Deepak Choudhary
Deepak Choudhary Před 2 hodinami
For the same force, mass is decreasing as it hits the table. Hence, an increase in momentum as it's free fall.
Saleh Al Harethi
Saleh Al Harethi Před dnem
The variable is the ground zero, acceleration of falling is constant, so time to reach ground zero must be shorter as its elevation increases.
Oddzey Před 11 dny
There's nothing more eerie than a science CS-vidr asking a question and then not answering it. Edit: some of you seem to not understand that this was a joke. science youtubers usually follow up a question with a direct explanation. this video simply reminded me of the video where Michael says "Hey! Vsauce! Michael here! where are your fingers..."
Mr. Sader
Mr. Sader Před 4 dny
it's called an anomaly . how many will guess at it ?. and how many people will actually think about it. and how many people take the challenge , find the answer and learn something. life is full of creativity, find it where you may . - DaVinci's 40 answers
John Blackwell
John Blackwell Před 10 dny
@themoistbanana someone else commented the answer and it totally made sense once I read it.
CREWiii Před 11 dny
@themoistbanana The Waffle House has found it's new host.
Austin Garland
Austin Garland Před 11 dny
It’s in the full video…these are CS-vid shorts
themoistbanana Před 11 dny
​@John BlackwellI'm thinking it's as simple as the fall distance is further for the second ladder
Rhisa David
Rhisa David Před dnem
The comment below about each impact being translated into a twisting motion seems very credible and may be more significant this but I notice the shockwave from each impact travels up the chain as a sine wave. If you look closely you can actually see it oscillating and the wave ‘travels’ up faster than the ladder travels down. With each impact a new wave is created curving the chain even more thus almost imperceptibly shortening the distance between rungs. The net effect of which is a slight but cumulative acceleration force ‘pulling’ the ladder down slightly quicker with each impact than would gravity alone. The final rung then lands slightly ahead of its straight-chained counterpart. Add this to the twisting motion and you’ve got a ball game.
cool rudds
cool rudds Před 5 dny
Answer - Because when the ladder hits the surface it bounces back up and hits the next ladder falling down. The next ladder is hit and falls slightly to one side or the other side. Falling to the side rather than straight down can only be achieved if there was more force, because the ladders are connected. You can see that the ladders fall further and further away. The further away they land the more additional pull there is. This theory can be proved by adding a non bounce coating and to have the ladders fall into a slot where they do not move to the side.
Master Chief
Master Chief Před 2 dny
I guess because of the chaos that occurred in the zone of contact, causing ladder to have much net pull generated.
Something Something
It is quite simple. Since the rope is flexible, impact from hitting the bottom surface will not be able to subtract from it's current velocity. However, the vibration from the impact does make the rope slightly tug the next step. Thus incrementing it's falling speed with every tug, no matter how small. When you have enough small changes, you can influence a whole.
oldretireddude Před 16 dny
The angled rungs are the key to this. As a rung contacts a surface a rotational force happens to that rung causing the free end to tug harder on it's rope. The ladder that hits first begins this repeating cycle of tugging first thus completing the cycle first, dragging the last of the ladder down first.
rrkunath Před 11 dny
Nope. Conservation of momentum
Jon Towers
Jon Towers Před 11 dny
Jon Towers
Jon Towers Před 11 dny
​@Slick Ricknope
Jupiter Cyclops
Jupiter Cyclops Před 12 dny
The one on the left was shorter and the rungs not as deep. Not physics, just an old camera trick
Frisky Frisk
Frisky Frisk Před 12 dny
@Bryan Cline that is incorrect. The mechanism has nothing to do with the shape/ braiding of the rope. It has been measured and done with single strands, and usually chains. Google folding falling chain problem.
David Hardman
David Hardman Před 4 dny
Each angled rung hitting the table transfer's it's kinetic energy to the other side of the rung tugging on the knot times the number of rungs to determine rate of acceleration. To determine T time you need to determine the kinetic E value of one rung in free fall then apply the fulcrum value at specific angle time number of rungs. Similar to pulling in a rope hand over hand
matt bown
matt bown Před 13 hodinami
The ladder's steps are at an angle. Since a low side hits first, the opposite side will apply a tensions force/torque on the ladder above. I'd like to see this done with level steps. I bet we wouldn't see this.
Daniele K.
Daniele K. Před 3 dny
3d Newton's law: *To every action, there is always opposed an equal reaction* The pieces of the ladder hitting the table go back up with the same and equal F (minus friction, gravity, etc etc) hence we have a -F which acts on the cords, and as a result are pulling (down) the rest of the ladder. But I am probably wrong also on this one.
stephen smart
stephen smart Před 2 dny
An angled stick falls slightly quicker than a parallel stick due to rotation force imparted when one side impacts the table and since the sequentially angled rungs are tied to make a ladder each slight increase in fall is cumulative
Tomas Casarotti
Tomas Casarotti Před 11 dny
There is a slight "pull down" effect due to the angle at which the beams hit the surface, almost like a "leverage" effect. You can observe the additional tension transferred on the opposite side to the first side that impacts the surface. That extra energy transfer is enough to compile into a visible acceleration on the left ladder. Also, as more links impact the surface, if you focus on the further (up) beams, you can see the effect of the pull-down that I'm referring to. There are other observable events, such as the energy of the impact and the " force of the bounce" being transferred to the other ladder links.
Reef Sta
Reef Sta Před 11 dny
Sicky Popp
Sicky Popp Před 11 dny
this is the reason
D K Před 11 dny
More than just a slight effect. It’s significant.
Passing by.
Passing by. Před 11 dny
Tomas, you took the words out of my mouth!
Pedro Molinero
Pedro Molinero Před 11 dny
U dropped this king👑
Aklını kullanan sıradan insan
angle of the sticks cause a rotational force while touching the floor. This rotation, - as you may observe at the upper side of the ledder - causes a pulling effect.
Jack Goloff
Jack Goloff Před 18 hodinami
According to String Theory. The free falling rung above the "first contact" element enters a tightly compact 7th dimension. Thereby, the vacuum generated in the quantum foam accelerates the time axis as seen in our 3 dimensional universe. This is a trompe l'oeil in that if your relative point of obsrvation originates from within the 7th dimension, the rate of free fall appears equivalent.
Mages Před dnem
The rungs are deflecting in the Z direction (with respect to the viewed perspective) so the string is being pulled down at a faster speed as the rung deflects in the Z. Think of it like a connecting rod in a car engine.
Haga’ Marianas
Haga’ Marianas Před dnem
Because vibration is added to the ladder on the left, therefore releasing the tension. Which then creates pockets of space that allow the remaining ladder to quickly fill in the “voids” of tension-free spaces. Thus, pulling the ladder downward at a faster rate
Adrian Untalan
Adrian Untalan Před 12 dny
My guess is that because the rungs aren’t parallel, when the first one hit the surface, it caused it to torque thus pulling on the opposite end. This tugged a little on the rest of the ladders and repeats every time a rung hits the surface. The tiny tugs compound until the difference is very visible. That’s my answer when looking at it on a per element basis. The math becomes a bit confusing when trying to analyze the system as a whole
Joseph Ghodsee
Joseph Ghodsee Před 12 dny
This is my answer too
Rybz Před 12 dny
My exact thought!!!
jigglie Před 12 dny
Yea that seems like that's what is going on. Nice observation. I observed this as a kid just never cared why lol
Linked Neurons
Linked Neurons Před 12 dny
I think you are... ...right. if you look at one side for awhile, you can see slight tugs on ore or the other side.
Andrew Smith
Andrew Smith Před 12 dny
You're correct. The energy is transferred to the chain on rung impact, pulling the rest faster
Richard Desjardin
Richard Desjardin Před 2 dny
Because the one hitting the table imparts force into the chain letting out the slack earlier than the one that hits the floor. You can watch it happen. It's just the chain fountain problem in reverse.
Jeremy Coleman
Jeremy Coleman Před 4 dny
So when it first hits the table, both ladders still appear the same but the table side speeds up. I think as they land, then slip lower to the table it pulls the string again, speeding up the left side in smaller increment.
Ira Tozer
Ira Tozer Před dnem
As the placement of the rungs are offset, the rung hitting the table causes the rung to give a slight jerk to the rope increasing acceleration.
bapple Před dnem
I know why. It’s because the way the logs fall on the left one causes them to see saw and then pulls the next log down because the end that see saws down is connected to the shorter rope.
MrMizfit Před 12 dny
The rungs are tied together. As each rung hits, the rope that connects them is displaced. Creating a small tug of downward force. This causes the next rung to fall a little faster. Which in turn causes a compounding domino effect with each rung that follows. Increasing the rate at which the remaining parts of the ladder fall. Making the object fall faster.
TJ Blues
TJ Blues Před 10 dny
@w's sometimes a vowel re > But could there also be some shock wave traveling up the rope and the sine wave cause some slight acceleration as well? In all experiments all physical laws take place. So you can even argue that the heat generated by rungs hitting the table affect speed of that falling ladder. The problem is how much does it affect it? In this case -- not much. BTW. A shock wave _is a type of propagating disturbance that moves _*_faster than the local speed of sound_*_ in the medium._ In the falling ladder experiment nothing like that happens.
gerry secure
gerry secure Před 12 dny
@FIFO Crew Wow, that explains it of course.
Donivan Hummel
Donivan Hummel Před 12 dny
You explained it better than I explained it lol. I think I said momentum while you said downward force. Yours sounds better and more thoroughly explained his question.
w's sometimes a vowel
@TJ Blues awesome!! This makes more sense. The angular momentum seems like it would speed up the descent more than vibrations. But could there also be some shock wave traveling up the rope and the sine wave cause some slight acceleration as well? The angled rungs I think would also create more of a shock "ripple" in the rope. The harmonic resonant frequency would increase as the rope shortens; Like a finger sliding up a plucked guitar string.
yulie135 Před 12 dny
Is this a group project? I'm joining this group
Jay Davidson
Jay Davidson Před dnem
Once the ladder on the left hits the table it no longer has air resistance on the part that has stopped, while the ladder on the right has its entire length subject to air resistance.
Rajendra Misir
Rajendra Misir Před 6 hodinami
Both ladders fall at the same rate. Acceleration due to gravity for both free falling ladders is the same. When one ladder hits the table and the other ladder hits the ground, both ladders are no longer free falling. Both ladders fall from different heights. The table stands on the ground. The ladder that hits the table comes to rest before the ladder that hits the ground comes to rest.
João Lucas Pires
As the ladders touches the ground the area affected by air resistence reduces and it prevents the ladder B from losing speed as the free-falling one does.
scrutenize Před 5 dny
The one on the right has reached terminal velocity and can no longer speed up but the left one is getting hit by an upward force which give the object a small speed boost which therefore makes it fall faster than the other
Paul Girard
Paul Girard Před 12 dny
Due to each step being inclined, one side touch the table first pulling the string of opposite side due to inertia which accelerates the fall.
superblahmanofdoom Před 12 dny
Inertia is it. The ladder steps fall "again" to the side and drag down the rest of the ladder faster.
GIGA Před 12 dny
@ChefBoyareB If you look closely you will notice the one on the left is vibrating a lot more. It's gravitational pull due to the impact. Things bounce and that additional recoil as it lands the 2nd time creates a secondary pull. When you drive a car and you brake really hard your body goes forward then it goes back then it goes to its resting position that is 3 different locations. The ladder will generate gravitational pull until it stops moving.
Michael Před 12 dny
Strange though.. the left looses weight at an increasing rate to
GIGA Před 12 dny
@ChefBoyareB no you can't. What you see are the strings caving in because they are collapsing.
Dominik Lizak
Dominik Lizak Před 12 dny
Exactly what I was thinking. NOT😂
Clova Před 42 minutami
When the impact of one side actually collides with the floor, it pulls the other side of the string making it slightly faster
Rodrigo Romero
Rodrigo Romero Před 6 hodinami
Since no External forces do work on the ladders, their centers of Mass should falla at the same rate. Since the ladder above the table can not fall beyond the table, Its upper part must fall faster.
EL NAZ Před 3 dny
I'm not a science geek, but I'm pretty sure the energy of the impact made it shrink faster.
Lastrem Před dnem
I believe it has something to do with potential energy and kinetic energy. Potential energy converts to kinetic energy. Potential energy is different because the distance the ladders have to travel to stop is different. The right has more potential energy relative to the left and converts all it’s potential energy into kinetic energy when it reaches the floor. The left converts its Potential energy to kinetic energy and coverts its Potential energy faster due to the shorter distance. To be clear, The total Potential energy is the same for both ladders if measured from the floor and the left preserved its remaining Potential energy by stopping at the table. I also think that the individual rungs connected with the wire has an impact on the rate of speed of the top rung.
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