A box full of books rests on a wooden floor. The normal force the floor exerts o

Question

A box full of books rests on a wooden floor. The normal force the floor exerts on the box is 237 N.
(a) You push horizontally on the box with a force of 129 N, but it refuses to budge. What can you say about the coefficient of static friction between the box and the floor?
?s >_______

(b) If you must push horizontally on the box with a force of at least 135 N to start it sliding, what is the coefficient of static friction?



(c) Once the box is sliding, you only have to push with a force of 119 N to keep it sliding. What is the coefficient of kinetic friction?

Explanation / Answer

(a)us>129/237=0.544 (b)us=135/237=0.57 (C)uk=119/237=0.502

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