physics crossword puzzle

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Across
  1. 5. when net force = 0
  2. 7. unit of length
  3. 9. measures force of gravity on an object
  4. 11. pull or push
  5. 12. objects motion changes
  6. 14. unit of force
  7. 16. energy in motion
  8. 18. stored energy
  9. 19. movement
Down
  1. 1. force caused by 2 objects rubbing together
  2. 2. how far an object moves in a certain time
  3. 3. objects resisting a change in motion
  4. 4. formulated the 3 laws of motion
  5. 6. newton's third law
  6. 8. speed in a given direction
  7. 10. how much matter is in an object
  8. 13. rate at which velocity changes
  9. 15. steepness of a line on a graph
  10. 17. force that pulls objects towards each other