Sketchyphysics is physics plug-in for Google SketchUp. It combines a simple and easy to use interface with the power of a fast and accurate physics library, the Newton SDK. Sketchy Physics plug-in provides most of the functionality of the Pro version of SketchUp in the free version of SketchUp, namely, the ability to provide controllable animation functionality.
New Version of Skethyphysics 3.1 released with the different types of features in many changes like in formal version and can be posted to 3d warehouse. There are many more features like sound support and , powerful new scripting commands, runtime error checking, logging support, checking new updates and many more.
All the versions of Sketchyphysics are available for download