Marie pushes horizontally on her desk,but not hard enough to get it moving.The friction force acting on the desk is
A)zero.
B)equal to the weight of the desk.
C)equal and opposite to her push.
D)none of the above

Question

Quizplus · Accepted Answer

The friction force acting on an object is always in the opposite direction to the direction of the force applied to the object. So, if Marie pushes horizontally on her desk but doesn't get it moving, there must be a frictional force acting on the desk that is equal and opposite to her push. Therefore, the best choice is C.

Marie Pushes Horizontally on Her Desk,but Not Hard Enough to Get