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長さが異なる振り子を一斉に揺らしたときの軌跡が美しすぎる

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長さの異なる15個の振り子を同時に揺らしたときの軌跡を撮影した動画のご紹介です。

[YouTube] Pendulum Waves

Fifteen uncoupled simple pendulums of monotonically increasing lengths dance together to produce visual traveling waves, standing waves, beating, and (seemingly) random motion.  For more details see http://sciencedemonstrations.fas.harvard.edu/icb/icb.do?keyword=k16940&pageid=icb.page80863&pageContentId=icb.pagecontent341734&state=maximize&view=view.do&viewParam_name=indepth.html#a_icb_pagecontent341734  The period of one complete cycle of the dance is 60 seconds. The length of the longest pendulum has been adjusted so that it executes 51 oscillations in this 60 second period. The length of each successive shorter pendulum is carefully adjusted so that it executes one additional oscillation in this period. Thus, the 15th pendulum (shortest) undergoes 65 oscillations.  Our apparatus was built from a design published by Richard Berg [Am J Phys 59(2), 186-187 (1991)] at the University of Maryland. The particular apparatus shown here was built by our own Nils Sorensen.  Like us on Facebook! http://www.facebook.com/NatSciDemos  Video courtesy of Harvard Natural Sciences Lecture Demonstrations, © 2010 President and Fellows of Harvard College

[YouTube] Wave pendulum

SDSU's Professor Anderson demonstrates the wave pendulum, a collection of 15 oscillators of varying period. The results are visually intriguing.

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