A 10.0 kg block is dragged overa rough, horizontal surface by a 73.0 N force act

Question

A 10.0 kg block is dragged overa rough, horizontal surface by a 73.0 N force acting at 20.0° above thehorizontal. The block is displaced 4.50 m, and the coefficient of kinetic frictionis 0.300. (a) Find the work done on the block by the 73.0 N force.
J
(b) Find the work done on the block by the normal force.
J
(c) Find the work done on the block by the gravitational force.
J
(d) What is increase in internal energy of the block-surface systemdue to friction?
J
(e) Find the total change in the block's kinetic energy.
J (a) Find the work done on the block by the 73.0 N force.
J
(b) Find the work done on the block by the normal force.
J
(c) Find the work done on the block by the gravitational force.
J
(d) What is increase in internal energy of the block-surface systemdue to friction?
J
(e) Find the total change in the block's kinetic energy.
J

Explanation / Answer

Mass m = 10 kg

Force F = 73 N

Angle = 20 degrees

Displacement S= 4.5 m

Coeffcient of kinetic friction = 0.3

(a). work done W = FS cos 20

                              = 308.68 J

(b). work done by normal force = 0

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