Tuning forks, various.

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

Tuning forks, various.
UCB Index: 
B+10+60
PIRA Index: 
3D46.15
Demo Diagram: 

UCB Taxonomy:

PIRA Taxonomy:

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B+10+55 Java Applet: A-vector and V-vector arrows
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B+10+65 Pocket watch with mirror and laser twitches with balance wheel motion.