Item NG017003: The motion energy of a ball rolling back and forth in a curved track is converted to gravitational potential energy only when it is rolling uphill.

A ball, starting from rest at Position 1, rolls down and then up a curved track towards Position 5.  The ball speeds up as it rolls from Position 1 to Position 3, and it slows down as it rolls from Position 3 to Position 5.  When it reaches Position 5, it rolls back down the track.


When is the motion energy (kinetic energy) of the ball being transformed into gravitational potential 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 motion energy (kinetic energy) cannot be transformed into gravitational potential energy.

Distribution of Responses

Chart showing distrubtion of responses for Item NG017003

Percent of students responding correctly

Overall34%
Grades 6–831%
Grades 9–1238%
Male36%
Female31%
Primary Language is English34%
Primary Language is not English30%

View data table