OMG, sorry, I kept on editing the same file, let me revert to original... But shouldn't friction prevent rotation? I want it to rotate, but to stop quickly...
I'm going to try what you said and see what happens (and save it in another file, sorry, I reverted this to the original).
What I'm really trying to do is make two balls (rotating normally) attract to each other, and once they're in contact, the bigger ball can take the other around. Like a planet carries things and not let them stay in the same point of space.