Question

You are riding a skateboard down the sidewalk and stop pushing yourself forward. The skateboard slows down and comes to a stop. What form of energy did the skateboard initially have? What energy conversion occurred as the skateboard was slowing down?

Answer 1

Initially the energy was kinetic energy and in some proportion sound energy. After you stop pushing yourself yo slow down; this means that the kinetic energy is being converted in another kind of energy; the conversion occurring is kinetic energy converting to heat and sound energy, that's why the wheels heat up (get hot) and you hear the sound. All the energy you had eventually transform in those types and you stop.