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 232 N.

(a) You push horizontally on the box with a force of 128 N, but it refuses to budge. What can you say about the coefficient of static friction between the box and the floor?

u > ___

(b) If you must push horizontally on the box with a force of at least 137 N to start it sliding, what is the coefficient of static friction?
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(c) Once the box is sliding, you only have to push with a force of 116 N to keep it sliding. What is the coefficient of kinetic friction?
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Explanation / Answer

Still the box doesn't move i.e N = F

*232 > 128

>.55

*232 = 137 ( for just sliding )

coefficient of static friction = .59

k.232 = 116

k = coefficient of kinetic friction = .5

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