1. The motion of a roller coaster car as it travels around the track: This involves energy transformations. The potential energy of the roller coaster car at the top of the track is transformed into kinetic energy as it descends.

2. A space craft moving through space at a constant velocity: This does not involve energy transformations. Once the spacecraft has reached its desired velocity, no further energy input is required to keep it moving at that velocity due to the lack of friction in space.

3. The use of an ice pack on an athlete's injured knee: This involves energy transformations. The chemical potential energy in the ice pack is transformed into thermal energy as it cools the athlete's knee.

4. The Sun warming your skin on a hot summer day: This involves energy transformations. The nuclear energy in the sun is transformed into electromagnetic energy (light), which is then transformed into thermal energy when it reaches your skin.

Question

1. The motion of a roller coaster car as it travels around the track: This involves energy transformations. The potential energy of the roller coaster car at the top of the track is transformed into kinetic energy as it descends.

2. A space craft moving through space at a constant velocity: This does not involve energy transformations. Once the spacecraft has reached its desired velocity, no further energy input is required to keep it moving at that velocity due to the lack of friction in space.

3. The use of an ice pack on an athlete's injured knee: This involves energy transformations. The chemical potential energy in the ice pack is transformed into thermal energy as it cools the athlete's knee.

4. The Sun warming your skin on a hot summer day: This involves energy transformations. The nuclear energy in the sun is transformed into electromagnetic energy (light), which is then transformed into thermal energy when it reaches your skin.

Knowee AI · Accepted Answer

1. The motion of a roller coaster car as it travels around the track: This involves energy transformations. The potential energy of the roller coaster car at the top of the track is transformed into kinetic energy as it descends.

2. A space craft moving through space at a constant velocity: This does not involve energy transformations. Once the spacecraft has reached its desired velocity, no further energy input is required to keep it moving at that velocity due to the lack of friction in space.

3. The use of an ice pack on an athlete's injured knee: This involves energy transformations. The chemical potential energy in the ice pack is transformed into thermal energy as it cools the athlete's knee.

4. The Sun warming your skin on a hot summer day: This involves energy transformations. The nuclear energy in the sun is transformed into electromagnetic energy (light), which is then transformed into thermal energy when it reaches your skin.

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