Force ,Motion, Gravity puzzle

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Across
  1. 4. motion of a moving body to move
  2. 7. force which a planet pulls closer
  3. 8. an object's ability to gain speed
  4. 11. unit of measurement for force
  5. 12. energy when an object is at rest
  6. 14. Strength from a physical movement
  7. 16. when the forces push equally
  8. 17. how far an object has moved
  9. 19. energy it has from motion
Down
  1. 1. the result of trying or attempting
  2. 2. non constant varies
  3. 3. energy created by soundwaves
  4. 4. process of changing position
  5. 5. energy created by heat
  6. 6. resistance from objects rubbing
  7. 9. something that will stay the same
  8. 10. when forces are unequal
  9. 13. the way an object moves
  10. 15. activity causing effort/energy
  11. 18. keeps an object in motion