Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsEffect of Friction on Ball Rolling Down a Ramphttp://demonstrations.wolfram.com/EffectOfFrictionOnBallRollingDownARamp/]]>http://demonstrations.wolfram.com/EffectOfFrictionOnBallRollingDownARamp/