Projection of Uniform Circular Motion
A point P moving on a circular path with a constant angular velocity ω is undergoing uniform circular motion. Its projection on the x-axis undergoes simple harmonic motion. Also shown is the velocity of this point around the circle, v−max, and its projection, which is v. Note that these velocities form a similar triangle to the displacement triangle.
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"OpenStax College, College Physics. October 7, 2012."
http://cnx.org/content/m42245/latest/?collection=col11406/1.7
OpenStax CNX
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