A donkey pulls a crate up a rough, inclined plane at constant speed. Which one of the following statements concerning this situation is false?
A)The gravitational potential energy of the crate is increasing.
B)The net work done by all the forces acting on the crate is zero joules.
C)The work done on the crate by the normal force of the plane is zero joules.
D)The donkey does "positive" work in pulling the crate up the incline.
E)The work done on the object by gravity is zero joules.

Question

Quizplus · Accepted Answer

The work done on the object by gravity is not zero joules; gravity does negative work as it acts in the opposite direction to the displacement of the crate.

A Donkey Pulls a Crate Up a Rough, Inclined Plane