Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsUnforced, Damped, Simple Harmonic Motionhttp://demonstrations.wolfram.com/UnforcedDampedSimpleHarmonicMotion/]]>http://demonstrations.wolfram.com/UnforcedDampedSimpleHarmonicMotion/Understanding 1D Motionhttp://demonstrations.wolfram.com/Understanding1DMotion/]]>http://demonstrations.wolfram.com/Understanding1DMotion/