Question: What minimum horizontal force F is needed to pull wheel of radius R and mass M over a step of height h as shown in

What minimum horizontal force F is needed to pull wheel of radius R and mass M over a step of height h as shown in Fig. 9-72 ( R > h)?
(a) Assume the force is applied at the top edge as shown.
(b) Assume the force is applied instead at the wheel€™s center.

F (in a) -F (in b)

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