A 750 N box rests on a floor with a coefficient of static friction = 0.800 and coefficient of kinetic friction = 0.600.What is the force of friction if a horizontal force of 550 N is applied to the box?
A) 600 N
B) 450 N
C) 750 N
D) 550 N
E) 440 N

Question

Quizplus · Accepted Answer

The force of static friction is calculated as the product of the coefficient of static friction and the normal force. The maximum static friction is 0.800 * 750 N = 600 N. Since the applied force of 550 N is less than the maximum static friction, the force of friction is equal to the applied force, which is 550 N.

A 750 N Box Rests on a Floor with a Coefficient