Visualizing Simple Harmonic Motion
Graphs of x(t),v(t), and a(t) versus t for the motion of an object on a spring. The net force on the object can be described by Hooke's law, and so the object undergoes simple harmonic motion. Note that the initial position has the vertical displacement at its maximum value X; v is initially zero and then negative as the object moves down; and the initial acceleration is negative, back toward the equilibrium position and becoming zero at that point.
Source
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"OpenStax College, College Physics. October 7, 2012."
http://cnx.org/content/m42242/latest/?collection=col11406/1.7
OpenStax CNX
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