A 750 N box rests on the floor. The coefficient of static friction between the box and the floor is 0.800, and the coefficient of kinetic friction is 0.600. If a horizontal force of 550 N is applied to the box, what will be the magnitude of the force of friction on the box due to the floor?
A) 600 N
B) 450 N
C) 750 N
D) 550 N
E) 440 N

Question

Quizplus · Accepted Answer

The maximum static friction force is 0.800 * 750 N = 600 N. Since the applied force of 550 N is less than this, the box does not move, and the static friction force equals the applied force, which is 550 N.

A 750 N Box Rests on the Floor