A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50.
-Suppose that the block now moves across the surface with constant speed under the action of a horizontal 3.0-N force. Which one of the following statements concerning this situation is false?
A)The block is not accelerated.
B)The net force on the block is zero newtons.
C)The frictional force on the block has magnitude 3.0 N.
D)The coefficient of kinetic friction between the block and the surface is 0.30.
E)The direction of the total force that the surface exerts on the block is vertically upward.

Question

Quizplus · Accepted Answer

The total force that the surface exerts on the block includes both the normal force (vertically upward) and the frictional force (horizontally opposing the motion), so it is not solely vertically upward.

A 20-N Force Acts Horizontally on a 10-N Block That Is