Item NG084002: Assuming that no energy is transferred between a ball and the curved track it is moving in, or between the ball and the air around it, the ball will only move to a height equal to the height from which it started. It will not be able to go over a hill that is higher than the point from which it started.

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.  The ball starts from rest at the position labeled Start and moves along the track toward Positions 1, 2, 3, and 4.

What is the highest position the ball will reach before stopping and going back down the track?  (Remember that no energy is transferred between the ball and the track or between the ball and the air around it.)

  1. Position 1
  2. Position 2
  3. Position 3
  4. Position 4