Pocket watch with mirror and laser twitches with balance wheel motion.

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(B)Waves - B+10: Simple Harmonic Motion

Laser Beam bouncing off Pocket Watch with mirror. The pocket watch twitches with the motion of the balance wheel. The laser beam hits the mirror on the watch and is deflected
UCB Index: 
B+10+65
Demo Diagram: 

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B+10+60 Tuning forks, various.
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B+10+70 Four pendulums on rod: Same mass, different lengths.