You push horizontally on a 140-N box that is initially resting on a horizontal table. The...
You push horizontally on a 140-N box that is initially resting on a horizontal table. The coefficient of static friction between the box and the table is 0.75, and the coefficient of kinetic friction is 0.40. Find the friction force on the box if the push is equal to (a) 84 N; (b) 109 N.
Homework Answers
N = normal force = mg = 140 N
Limiting friction force 
105 N
a) force applied is less than limiting friction force hence box remain at rest
Applied force is balanced by friction force
friction force = applied force = 84 N
b) applied force is more than limiting friction force hence box moves
friction force = kinetic friction force = 0.4 x 140 = 56 N
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