Physics crossword puzzle

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Across
  1. 4. Acceleration = Force/Mass
  2. 5. Object in motion stays in motion
  3. 7. Energy that "hasn't happened" yet
  4. 9. What W is measured in
  5. 10. Force on the surface of the earth
  6. 13. Force on a curved path
  7. 17. Distance/unit time
  8. 18. Unit of force
  9. 19. Mass * Gravity
Down
  1. 1. Force that opposes sliding of two touching surfaces
  2. 2. Every action has an equal and opposite reaction
  3. 3. The path a projectile takes
  4. 6. Energy that "has happened"
  5. 8. How far something has moved
  6. 11. Change in velocity. Can be positive or negative
  7. 12. Push or pull
  8. 14. Force required to change an object's motion
  9. 15. Anything moving through the air that does not provide force for it's movement
  10. 16. Distance/unit time and in a direction
  11. 19. When force is applied to something and it moves