Vocab crossword puzzle

1234567891011121314151617181920
Across
  1. 3. a sphere of activity
  2. 6. a large number of people
  3. 8. gas around a planet
  4. 9. power
  5. 12. force between moving surfaces
  6. 13. planet
  7. 15. particular set of beliefs
  8. 16. heavy
  9. 18. the state of touching
  10. 20. energy that depends on the position
Down
  1. 1. engaged in physics to achieve a result
  2. 2. being in motion
  3. 4. velocity
  4. 5. speed
  5. 7. the top of something
  6. 10. a pull or push
  7. 11. the great size of something
  8. 14. gaining speed
  9. 17. the laws of newton
  10. 19. action of a object against another