Question

The figure depicts a yo-yo acted on by constant horizontal forces F1 = 45 N to the right and F2 to the left. The forces are applied, respectively, at distances 2R and R from the yo-yo's central axis, i.e. the larger circle has two times the radius of the smaller circle. It is observed that the yo-yo rolls without slipping on a horizontal table with constant velocity to the right. Find the magnitude of the force of static friction exerted by the surface of the table on the yo-yo.

Answer 1