Item NG016003: When a ball rolls downhill, the gravitational potential energy of the ball is transformed into motion energy.

A ball is rolling up and over a hill.  The ball slows down as it moves from Position 1 to Position 3, and it speeds up as it moves from Position 3 to Position 5.

When is the gravitational potential energy of the ball being transformed into motion energy (kinetic energy)?

  1. Only when the ball rolls from Position 1 to Position 3
  2. Only when the ball rolls from Position 3 to Position 5
  3. The entire time the ball is rolling from Position 1 to Position 5
  4. It is not being transformed at any time because gravitational potential energy cannot be transformed into motion energy (kinetic energy).