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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Interesting slo-mo video of a slinky drop...
http://www.youtube.com/watch?v=uiyMuHuCFo4 I wouldn't have expected that behavior. comment: His theory is not wrong but there's a more direct explanation. Each ring gets slightly more tensile force from above than from below, exactly equal to the weight of that ring. This tensile force only depends on local extension. When the top is released, tensile force everywhere else is still the same so the lower parts have no reason to come down. Top ring comes down, tension immediately below is reduced, next ring starts moving too. Effect decreases exponentially, so limited to short distance. |
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