- #1

billy_button

- 1

- 0

Currently I have a hollow ball hitting the pack and releasing a solid ball at the end. I have calculated the velocities of both, assuming energy is conserved, from the linear and rotational KE's, resulting in the solid ball leaving the pack with a higher velocity than the hollow ball hit it with. This means however, that momentum has not been conserved (off the top of my head I think the solid ball gained momentum??).

I'm now assuming that it must really be conserved and I need to look at the torque applied to stop and start each ball? Does this sound right and if so 1)how do I calculate the torque or angular acceleration at the instant of the collision? and 2)would the same torque be applied to the ball leaving the pack?

For 'ease' of calculations I have assumed perfectly elastic collisions and no losses due to friction/air resistance.

I'd be most appreciative of any help.