Item RG159002: When one car hits another car and the speed of the cars changes, the change in speed is a sign that energy was transferred.

Two carts are rolling on a smooth flat surface. Cart A is rolling faster than Cart B and hits the back of Cart B.

After Cart A hits Cart B, both carts continue rolling forward. Each cart is going a different speed than it was before. Was energy transferred from Cart A to Cart B?

  1. No, Cart A does not have any energy to transfer.
  2. No, energy is not transferred when two objects hit each other.
  3. Yes, the change in speed is a sign that energy was transferred.
  4. Yes, energy was transferred, but the change in speed is not related to the transfer of energy.