Here are a couple of screenshots showing a quick animation of a rubber ball and a couple of slanted squished cubes. 1st- Insert a ball. Set it's motion to 'Physics.'Then set the balls physics parameter to 'rubber.' I then modified it a little bouncier. 2nd- Insert a 'Directional Force.' Leave it's default values. 3rd- Insert a cube, then squish it vertically. Rotate it slightly. Set the cubes physics parameters to 'wood.' Duplicate and rotate to taste for 4 of them. 4th- Place the ball up from the cubes slightly off-center so that it will bounce off of one of the cubes. 5th- Set the animation length to 12 secs 6th- Hit play on the animation controller bar. It will do it's math and you'll see a bar across the top, (see screenshot,) that will tell you when the calculations are done. It will play a little of the animation, then re-calculate the next couple of seconds. It will go back and forth playing and calculating until the end of the animation time is reached. 7th- Rewind and play again. It will play through without stopping to re-calculate. 8th- Render and enjoy! Hope this helps!