A block is at rest on an inclined plane and is connected to an object with the s

Question

A block is at rest on an inclined plane and is connected to an object with the same mass, as shown. The rope may be considered massless, and the pulley may be considered frictionless. The coefficient of static friction between the block and the plane is ?s; and the coefficient of kinetic friction is ?k. What is the magnitude of the static frictional force acting on the block? If the rope were cut between the block and the pulley, what would be the magnitude of the
acceleration of the block down the plane?

Explanation / Answer

the force acting along the surface of the inclined plane : mgSin(feta) and it is not moving so it is equal to the static friction. when rope is cut, it starts to move and kinetic friction will work.

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