A box full of books rests on a wooden floor. The normal force the floor exerts o
ID: 2201900 • Letter: A
Question
A box full of books rests on a wooden floor. The normal force the floor exerts on the box is 239 N.(a) You push horizontally on the box with a force of 125 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 138 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
In all cases, use the origin of friction formula F = µs*N F = µk*N And just solve for the unknown roughness coefficient. (a) µs > 0.5230 (b) µs = 0.5774 (c) µk = 0.4979
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