Physical Science Crossword Puzzle

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Across
  1. 4. Downward movement with gravity
  2. 6. Equal and Opposite Reaction
  3. 8. pre-hit momentum = post-hit momentum
  4. 9. Friction between base surface and a sliding object
  5. 10. Rubbing
  6. 11. Fastest you can go
  7. 14. F=MA
  8. 16. Has to touch
  9. 17. Force between moving forces
  10. 18. Tendency of an object to not change
  11. 19. Relative Mass
  12. 20. Object in motion stays in motion
Down
  1. 1. Push or pull
  2. 2. Mass and velocity
  3. 3. Gravity, Strong Nuclear, Weak Nuclear
  4. 5. Particle attracts every other particle
  5. 7. All forces
  6. 12. Friction when an object rolls
  7. 13. Don't have to touch
  8. 15. Force that keeps an object still