Joe and Bill are playing tug-of-war.Joe is pulling with a force of 200 N.Bill is simply hanging on,but skidding toward Joe at a constant velocity.What is the force of friction between Bill's feet and the ground?
A)200 N
B)400 N
C)less than 200 N
D)greater than 200 N,but less than 400 N

Question

Quizplus · Accepted Answer

Since Bill is moving at a constant velocity, the net force acting on him is zero. Therefore, the force of friction must be equal and opposite to the force Joe is pulling with, which is 200 N.

Joe and Bill Are Playing Tug-Of-War