when i don't change any parameters in the component fields in the flash IDE, it acts like it's supposed to.
it rotates when a force is added tot the side.
When i change the density from 10 to 100, it suddenly doesn't rotate anymore, when forces are applied. furthermore, the object still acts like it's lightweigh, it just doesn't rotate.
Well, when you increase the density you're going to have to apply a lot more force or torque to get it rolling. Could it be you're force just isn't strong enough? I would try setting angularVelocity directly to see if that works first.