http://web.mac.com/avisaria/PhysicsProject.mov [Broken] I need help, at the moment I have line/circle/polygon intersection detection. It gives me the exact points where objects collide though now I need to build the actual physics part. What you guys saw was pretty generic, my attempt at trying to scratch up what I learned in Physics class and apply it here. Could you guys help me? If you have any formulas, variables, input, anything at all, it'd be very helpful. At the moment a formula or tip to get the xVelocity and yVelocity from a ball with mass(m) when hitting an inclined plane with gravity(g) and friction(f) would be wonderful. Thanks, -Gan P.S. If you want me to post the source just say so.