Across
- 3. a sphere of activity
- 6. a large number of people
- 8. gas around a planet
- 9. power
- 12. force between moving surfaces
- 13. planet
- 15. particular set of beliefs
- 16. heavy
- 18. the state of touching
- 20. energy that depends on the position
Down
- 1. engaged in physics to achieve a result
- 2. being in motion
- 4. velocity
- 5. speed
- 7. the top of something
- 10. a pull or push
- 11. the great size of something
- 14. gaining speed
- 17. the laws of newton
- 19. action of a object against another