Item NG013002: As a rubber balls falls to the floor, the motion energy of the ball increases and the gravitational potential energy of the ball decreases because the gravitational potential energy is transformed into motion energy.

A rubber ball speeds up as it falls toward the floor.  How do the motion energy (kinetic energy) and gravitational potential energy of the ball change as it falls and why?

  1. Both the motion energy and gravitational potential energy increase because new energy is always made as an object moves.
  2. Both the motion energy and gravitational potential energy decrease because energy is always used up as an object moves and is not transformed into any other form of energy.
  3. The motion energy decreases and the gravitational potential energy increases because the motion energy is transformed into gravitational potential energy.
  4. The motion energy increases and the gravitational potential energy decreases because the gravitational potential energy is transformed into motion energy.

Distribution of Responses

Chart showing distrubtion of responses for Item NG013002

Percent of students responding correctly

Overall32%
Grades 6–827%
Grades 9–1239%
Male32%
Female32%
Primary Language is English32%
Primary Language is not English25%

View data table