Physics crossword.

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Across
  1. 4. How does a ball roll?
  2. 6. It's the reason you don't float away.
  3. 8. How much matter is in an object.
  4. 12. A quantity that has magnitude and direction.
  5. 13. The quantity of motion of a moving body, measured as a product of its mass and velocity.
  6. 14. Your set of judgments of an object.
  7. 16. The way you measure how fast an object is moving.
  8. 18. I feel dizzy.
  9. 20. How fast an object gets up to speed.
  10. 22. Newton's second law.
  11. 23. The speed of something in a given direction.
Down
  1. 1. The way objects move on their own.
  2. 2. Splash splash.
  3. 3. The thing that keeps you from sliding around.
  4. 5. It keeps stuff from moving.
  5. 7. Newton's first law.
  6. 9. Newton's 3rd law.
  7. 10. Skydivers love it.
  8. 11. Fully described by magnitude.
  9. 15. The point you look at something from.
  10. 17. How far away something is from something else.
  11. 19. This one's pretty heavy.
  12. 21. An object in ______.