- #1
NasuSama
- 326
- 3
Homework Statement
Suppose the system is rotating clockwise when the metal disk is dropped on it. The direction of the frictional force is...
zero on the disk and the system
counter-clockwise on the disk, clockwise on the system
clockwise on the disk, zero on the system
counter-clockwise on the disk zero on the system
zero on the disk, clockwise on the system
clockwise on the disk and the system
counter-clockwise on the disk and the system
clockwise on the disk, counter-clockwise on the system
zero on the disk, counter-clockwise on the system
2. The attempt at a solution
I believe that the answer is:
"counter-clockwise on the disk, clockwise on the system"
But it is not right. I thought that a system keeps turning clockwise, and that when a disk is place on the system, then the frictional force acts counter-clockwise on the disk.