Particle Applet
This is a little applet that I wrote one very sunny day in May 2001, while I was studying in the PC hut for my first year Java exams. I have since lost the source code, if I ever find it I will fix the minor tunneling on the bottom edge!
The bounce slider controls how much energy is lost in a collision. Changes to the set on controls on the second line only take effect once the restart button has been pressed. The rest is hopefully self explanitory - Click all the button to see what happens.