I'm studying C2 and its physic system but have a problem/question:
I'm trying to build a mechanical simulator, with a pinion-gear to transfer torque from uno to the other.
It doesn't work. it seems that there is no friction between gears and it's weird.
if I make a byke or a car with physics, the torwue on the wheel make the vehicle move using the tyre-ground friction.
why a pinion can't make a gear to move?