Question

select the correct answer. which force causes a wagon to speed up as it rolls down a hill? a. friction b. gravity c. mass d. normal

Explanation:

Gravity is the force that pulls objects towards the center of the Earth. When a wagon rolls down a hill, the component of the gravitational force acting along the slope of the hill causes it to speed up. Mass is a property of an object, not a force. Friction opposes motion and would slow the wagon down. The normal force acts perpendicular to the surface and does not cause the wagon to speed up as it rolls down the hill.

Answer:

B. gravity