Rolling Is Easy!

A plank of mass \(M\) is placed a over smooth incline plane, and a sphere of mass \(m\) is also placed over the plank. Friction is sufficient to prevent slipping between the plank and the sphere. If the plank and the sphere are released from rest, then the frictional force on the sphere is \(\text{__________} \).


This is a part of my set Aniket's Mechanics Challenges.
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