Across
- 3. a group of objects that interact
- 7. when one form of energy changes to another, produces changes in indicators of energy
Down
- 1. these show the presence of energy [sound, light, temperature change (heat),
- 2. the process by which energy moves from one part to other parts of a system
- 4. a device that transforms motion energy into electrical energy
- 5. when two objects hit each other
- 6. of objects, and electrical energy]
- 8. something necessary to make things happen
- 9. the distance an object a certain amount of time