Physics Crossword Puzzle

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Across
  1. 1. The amount of matter inside something
  2. 4. Force equals -- times acceleration
  3. 6. The force acting on an object due to gravity
  4. 8. What force is measured in
  5. 10. Every action has an equal and opposite --
  6. 11. The tendency of an object to remain at rest or in motion
  7. 13. Same as speed but must have direction
  8. 14. A change in position
  9. 15. When the forces acting upon an object are not equal in both directions
Down
  1. 2. A change in velocity
  2. 3. When the forces acting upon an object are equal in both directions
  3. 5. An object at rest will stay in --
  4. 7. What attracts a body towards the center of the Earth
  5. 9. A push or pull on an object
  6. 12. Distance over time