- #1
joe5185
- 10
- 1
So if a ball is rolling down a ramp and not slipping, you have two torques... the mg*sin(theta) portion of gravity and the (mu)mgcos(theta) for friction. My question is this: Does this friction force remove energy from the ball? (I know it affects the balls rotation but this is just changing forms of energy) My teacher did a problem in class where we wanted to know the final velocity of the ball at the end of the ramp and I subtracted the work due to friction FD. Was I wrong to do this and if so why (my teacher said it was wrong but couldn't say why uggh)? Thanks so much guys