Question

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? The net force on the block is zero newtons. The coefficient of kinetic friction between the block and the surface is 0.30. The frictional force on the block has magnitude 3.0 N. The direction of the total force that the surface exerts on the block is vertically upward. The block is not accelerated.

Answer 1

The statement that is false in this situation is: The direction of the total force that the surface exerts on the block is vertically upward. The frictional force on the block has a magnitude of 3.0 N.

Step-by-step explanation:

The statement that is false in this situation is: The direction of the total force that the surface exerts on the block is vertically upward.

The frictional force on the block has a magnitude of 3.0 N, which is equal to the horizontal force applied to the block. Since the block is moving with a constant speed, the net force on the block is zero newtons. The coefficient of kinetic friction between the block and the surface is 0.30.

Therefore, the only false statement is the direction of the total force exerted by the surface on the block, which is horizontally opposite to the direction of motion.