Algodoo

Demonstration of a car that is powered by wind (simulated by bouncing balls containing in an overarching sliding box.) Which is able to move faster than the wind powering it. That this is possible is counter-intuitive but true, even in the real world. Many people refuse to believe this, so I made this simulation to help them understand.

This version has a rather small box. If you have CPU power to spare you can make it bigger and make more gas, then it will be possible to bring the car to a complete stop, and then watch it get up to speed and end up in front of the box without ever hitting the back wall.

Notice: Initial velocties are not saved, so give the box a push to begin with, otherwise there is no wind and it wil obviously not work.

Ref to: http://www.youtube.com/watch?v=xHsXcHoJu-A