If i do it that way, only ONE of the ball objects bounces, what happens if you roll one ball slowly and then roll another ball faster into it?
the fast ball does indeed bounce off the slow ball, but the slow ball doesn't just continue on its merry way as though nothing happened.
What i was trying to point out in my example is that the bounces for the ball behaviour only seem to work well if it hits something, not if something hits it.
It's not an entirely huge problem, but a ball behaving like a ball would be cool you know, newton's cradle and all that