1-) I started my entity 16 quants abobve the ground. I fixed that to 100 quants, and the problem was solved but... if I do the "disable, change position, enable" routine, the problem get's back! does that mean the only way of getting my entity on the ground is to make it fall from 100 quants???

2-) yes, it happened as you described. the ball acts completely normal, 100 quants from the ground or not, with the difference only being this freaky force applied.

3-) well, now that I thought about it, maybe the instant velocity of the moment the force is applied is NOT equal to the force vector...

EDIT: did some experimenting... but now it came to another issue: I need this physics entity to pass throught the passable sprites in my level, but it doesn't. I use a 2d sprite as a character, and no matter what I do, the ball always bounces on his head, but it should bounce on the ground. any ideas?

EDIT2: forget about the last edit, I was just setting the passable flag to the wrong entity ^^o