Item NG003003: Gravitational potential energy is transformed into motion energy and thermal energy when coasting down a hill on a bicycle.

A girl is riding her bicycle down a hill without pedaling.  She speeds up as she goes down the hill, and the tires get a little warmer.  What energy transformations happen while she is going down the hill?

  1. Motion energy (kinetic energy) is transformed into gravitational potential energy and thermal energy.
  2. Gravitational potential energy is transformed into motion energy (kinetic energy) and thermal energy.
  3. Gravitational potential energy is transformed only into motion energy (kinetic energy).
  4. No energy transformations are involved while she is going down the hill.

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