Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsDisk Rolling on a Horizontal Planehttp://demonstrations.wolfram.com/DiskRollingOnAHorizontalPlane/]]>http://demonstrations.wolfram.com/DiskRollingOnAHorizontalPlane/