A 3.00 kg block is released from rest at the elevated end A of a frictionless tr

Question

A 3.00 kg block is released from rest at the elevated end A of a frictionless track that slopes down to a point B and continues horizontally to a point D, beyond which is a rough horizontal surface (friction). The speed of the block at a point C between B and D is 7.20m/s, and the block comes to rest after sliding 2.77 m along the rough surface. a) (4 points) Find the work done on the block by the normal force exerted by the track. WN = ____________________ b) (4 points) Find the work done on the block by the gravitational force exerted by the earth. Wg =_____________________ c) (4 points) Find the height of A with respect to B. h = _____________________ d) (4 points) Find the work done on the block by the frictional force exerted by the rough surfaced Wf =________________________ e) (4 points) Find the coefficient of kinetic friction between the block and the rough surface.

Explanation / Answer

v^2 = vo^2 + 2as KE = 1/2 m v^2 momentum = p = mv potential energy = U = mgh

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