Shadow of a Ball Undergoing Simple Harmonic Motion
The shadow of a ball rotating at constant angular velocity ω on a turntable goes back and forth in precise simple harmonic motion.
Source
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"OpenStax College, College Physics. October 7, 2012."
http://cnx.org/content/m42245/latest/?collection=col11406/1.7
OpenStax CNX
CC BY 3.0.