- #1
benny1993
- 7
- 0
Suppose I have a system of two disks (identical in mass and size) one is fixed to a shaft at it's center point and rotating due to an external torque that's removed as soon as the rotational motion begins. The second disk is dropped from rest over the rotating disk and sticks together to the rotating disk. What would be the force that generates the torque that accelerates the disks during the collision?
If there are no external forces acting on the system (since the accelerating external force is removed as soon as motion begins), the net torque has to equal zero. I don't get what other force actually causes the torque the accelerates the already rotating disk (which would be decreasing) and the torque that accelerates the dropped disk?
If there are no external forces acting on the system (since the accelerating external force is removed as soon as motion begins), the net torque has to equal zero. I don't get what other force actually causes the torque the accelerates the already rotating disk (which would be decreasing) and the torque that accelerates the dropped disk?