physics crossword puzzles

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Across
  1. 2. a force resisting the motion of two materials relative to each other
  2. 5. an invisible force that pulls objects toward each other
  3. 8. quantity that designates how fast and in what direction a point is moving
  4. 11. the change in position of an object
  5. 13. any object thrown into space upon which the only acting force is gravity
  6. 14. a quantity that has both magnitude and direction
  7. 15. a measurement that refers to the amount of matter that makes up an object
Down
  1. 1. rate at which velocity changes with time, in terms of both speed and direction
  2. 3. the sum of all the forces acting on an object
  3. 4. The rate of change of position of an object in any direction
  4. 6. The sudden force acting on an object for a short interval of time
  5. 7. The push or pull on an object with mass causes it to change its velocity
  6. 9. an object's tendency to stay at rest or, if moving, to keep moving.
  7. 10. a physical quantity that is completely described by its magnitude
  8. 12. the product of an object's mass and velocity.