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A chain that pulls itself onto the table it falls on


The two essentially identical chains were released  from rest at the same time. The one on the right falls in open air. The one on the left falls on a  table.

The collisions suck the left one down.

The left chain falls faster.

A chain that accelerates, rather than slows, due to collisions: how compression can cause tension
Anoop Grewal, Philip Johnson and Andy Ruina

American Journal of Physics
Volume 79, Issue 7, pp. 723, July 2011
http://ajp.aapt.org/resource/1/ajpias
Preprint



History of falling chain problems

What's wrong with the classical picture

Falling chain experiments  (MORE Slow motion VIDEOS HERE)

Ordinary chain (Videos here too)


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This page was updated on  March 13, 2011