## Item NG092002: Assuming no energy transfer between a ball and the track it is moving in, the amount of energy the ball has after it goes over a hill will be the same as before it went over the hill.

Imagine a ball on a track where no energy is transferred between the ball and the track or between the ball and the air around it.  It is going fast enough at Position 1 so that it will go over a hill on the track and past Position 2.  Position 1 and Position 2 are at the same height.

Will the total amount of energy the ball has at Position 2 be more, less, or the same as the total amount of energy the ball had at Position 1?  (Remember that no energy is transferred between the ball and the track or between the ball and the air around it.)

1. The total amount of energy the ball has at Position 2 will be more than the total amount of energy the ball had at Position 1.
2. The total amount of energy the ball has at Position 2 will be less than the total amount of energy the ball had at Position 1.
3. The total amount of energy the ball has at Position 2 will be the same as the total amount of energy the ball had at Position 1.
4. It depends on the speed of the ball before it gets to the hill.