A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A horizontal 140-N force is applied to the box. What is the friction force on the box?
A) 140 N
B) 16.5 N
C) 160 N
D) 42 N
E) 0.00 N

Question

Quizplus · Accepted Answer

The friction force equals the applied force (140 N) because the box does not move, indicating that static friction is at its maximum value but does not exceed the applied force.

A 55-Kg Box Rests on a Horizontal Surface