> And if it isn't visible, then what is the reason that you want to avoid
> it?

You want to avoid it because the particle which is bouncing back
is adding energy to the system, instead of losing energy
through damping.

To stabelize your system you need to (a) introduce damping
and (b) reduce the timestep. 

I had to reduce the timestep in the "Space particles" in p.b.a
several times in order not to have the system become instable
when multiple particles interacted.

Hope it helps..
 
 
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Willem de Wilde
Replace the DOT with dots: Willem DOT de DOT Wil### [at] Xs4allnl

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