Chain Drop Answer 2

Which weight hits the ground first - the free weight or the weight attached to the chain?

[roy]

Can you do the bungee jumping with another person side by side, but isn't connected with a cord? That would make me believe your theory

[jamesmitchell]

i love how this awnser video has only half the views

[veritasium]

"the railing cannot possibly have an effect on the weight until the chain is fully stretched" - I disagree. Consider a whip - the tip goes faster than the speed of sound by first throwing the whip out and then pulling back. This pulling back accelerates the tip before the the whip is fully extended.

[grampton]

Its so weird to watch Veritasium without the beard.

[steve]

"It felt fast. A great increase in speed". What is he comparing this experience to... the time he jumped off the bridge without a bungee cord?

[veritasium]

or another option would be to drop the chained weight with the other end of the chain on the ground. This means the chained weight still has the 'path' but not the whip effect. I would expect the weights to land together in this case. Kicking myself for not doing it while I had the gear.

[Maltanx]

We meet again, fellow traveler.
I have received the answer I was searching for, now I must continue my journey through the long forgotten depths of youtube.
We'll cross paths again, if the good algorithm will decide that is our destiny.
Farewell, fellow traveler, hope you will find the answers you seek.

[JustDoinFlorida]

Are we not gonna talk about how Derek’s Australian accent has basically disappeared compared to when this video was recorded?

[veritasium]

These sound like good experiments - you should do them!! (and report what happens)

[sysghost]

Aaawww... stop making me picking the wrong answer. I wanna be right.

[MegaFrankels]

You can also explain it as follows: The center of mass for the falling part of the chained mass moves up the chain as the bottom part of the chain becomes stationary. So the chained mass' center of mass starts off closer to the ground and thus the travel distance to the ground is smaller.
Then, as objects in gravity accelerate equally, the mass with less travel distance lands sooner.

[NilsO]

Nobody:

Youtube: Let's recommend this video 9 years later...

[wedmunds]

You can think of it as a change in center of mass. The center of mass accelerates at g, but the weight is some changing length above the center of mass. This length decreases as the chain falls, forcing the weight to accelerate faster.

[veritasium]

I don't think this explanation is accurate. The centre of mass only accelerates down at 9.8 m/s^2 if gravity is the only force acting. In this case, there is an upward force where the chain is attached to the railing, resulting in the whip effect discussed in the video.

[consumit]

I just noticed if he grows a moustache he would look like Freddie Mercury

[JLWorks]

He was so scared his inner aussie came out for a few seconds 🤣

[dragos]

Considering no mass attached, length l(=l/2+l/2), one end fixed on ceiling, the other in free fall, total mass M, distance from the ceiling x(t), energy conservation gives velocity x’^2 =gx(2l-x)/(l-x) and via Laplacian, acceleration of the free end which is greater than g. For x=l x” becomes infinite- whiplash effect !

[play_sports_and_read_books]

When you learn video editing from a former bollywood editor

[stephenbongiorno]

The whip acceleration comes from the link at the bottom of the chain as it is doing a 180 degree spin.  One end of this spinning link is held at a pivot point by the taut chain above.  The center of mass of the link falls at g, but the free end whips at a>g.  This puts a force on the free falling link attached to the whipping link, pulling the weight down.

[xscallcos]

Amasingly he didnt change in 9 years. He could upload this video today and a lot of people wouldnt even notice