Across
- 4. The force that pulls objects towards the Earth
- 5. The amount of matter in an object
- 8. To slow down or stop
- 9. A unit of force
Down
- 1. The energy of motion
- 2. A push or pull
- 3. The study of matter and energy and their interactions
- 5. The change in position of an object
- 6. How fast something moves
- 7. When two objects exert forces on each other