Item RG097002: After one ball collides with another, the first ball moves slower because it transferred energy to the second ball when the balls hit each other.

A player rolls Ball A toward Ball B as pictured in Figure 1. Then Ball A hits Ball B. Both balls continue to roll after the collision as shown in Figure 2.

Which of the following statements correctly describes Ball A’s speed in Figure 2 compared to its speed in Figure 1?

  1. Ball A is moving faster in Figure 2 because it gained energy from hitting Ball B.
  2. Ball A is moving slower in Figure 2 because it transferred energy to Ball B when the balls hit each other.
  3. Ball A is moving slower in Figure 2 because some energy was destroyed when the balls hit each other.
  4. Ball A is moving at the same speed because no energy was transferred when the balls hit each other.

Statistics for this item are available in the ASPECt Project.