force and motion vocabulary

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Across
  1. 2. force that resists the sliding or rolling of one solid object over another
  2. 5. fall state of a body that moves freely
  3. 9. action of moving or being moved
  4. 11. the rate at which an object is moving in a path
  5. 13. a force opposite in direction to an accelerating force acting on a body
  6. 14. A measure of the amount of matter
  7. 15. quickness in motion
  8. 17. the act or process of moving faster
Down
  1. 1. motion the motion of an object thrown into the air
  2. 3. a push or pull acting on an object
  3. 4. units
  4. 6. due to gravity the acceleration of a body in free fall under the influence
  5. 7. gravitational force of attraction on an object
  6. 8. product of the mass of a particle and its velocity
  7. 10. of reference an axes in which measurements of size, position or motion can be made
  8. 12. how far out of place an object is
  9. 16. velocity steady speed achieved by an object freely falling through a gas or liquid