A chain falls onto a table faster than_

Tim Hutton - 2014-01-15 11:37:19+0000 - Updated: 2014-01-15 11:37:19+0000

A chain falls onto a table faster than free-fall! The collisions with the table actually suck the chain downwards.

Now imagine a chain being pulled up from a table. The same thing happens in reverse, giving the chain an upward kick. And it is this force that explains the chain fountain, according to a new paper:
http://rspa.royalsocietypublishing.org/content/470/2163/20130689.full

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+1'd by: Robin Burkinshaw, Aaron Shaw, stefan jeffers, David Moore, Luis Guzman, Refurio Anachro, Michael Velik

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