A horizontal force F of 12 lb pushes a block weighing 5.0 lb against a vertical wall (Fig.) The coefficient of static friction between the wall and the block is 0.60 and the coefficient of kinetic friction is 0.40. Assume the block is not moving initially. (a) Will the block start moving? (b) What is the force exerted on the block by the wall?

Question

Aditi Chauhan · Answer

The weight of the block is 5.0 lb, and is smaller than static force of friction in magnitude. Therefore, the frictional force will manage to keep the block in position.
(b)
It is important to note that the magnitude of frictional force f_s that can hold the block in position is equal to its weight.

Therefore, the magnitude of net force acting on the block is 13 lb .

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