I\'ve scored the internet for sources and have found a lot of useful information, but they are math sites trying to tell me how to solve what angle an object has to be at to
Heres a nice library that might help you
http://sites.google.com/site/physics2d/
I haven't looked into it too much to be honest, I came across it in Scott Whitlock's code project article.
http://www.codeproject.com/KB/WPF/SoapBoxCorePinBallDemo.aspx