Rolling Is Easy!
A plank of mass is placed a over smooth incline plane, and a sphere of mass 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 .
This is a part of my set Aniket's Mechanics Challenges .
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1 solution
When both plank and sphere move down the plane They both experience the same acceleration(hain theta) down the incline which does not require any friction to prevent slipping Thus making the frictional force zero N