puzzle

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Across
  1. 3. a mechanical device that changes the direction or magnitude of a force
  2. 6. a measure of the ratio of output force to input force in a system
  3. 9. a force which tries to pull two objects toward each other
  4. 12. v=displacement/change in time
  5. 13. a=vf-vi/t
  6. 14. a measure of the heaviness of an object
  7. 15. the force the machine applies to the object trying to be moved
  8. 16. the moving of something from its place or position
  9. 17. F = ma
  10. 18. the change of position of an object within a given time
Down
  1. 1. net force is equal to mass x acceleration
  2. 2. Inertia is the tendency of objects in motion to stay in motion
  3. 4. s=distance/time
  4. 5. the amount of matter in an object
  5. 7. the force acting on an object that is moving through air flowing in the opposite direction
  6. 8. the sum of all the forces acting on an object simultaneously
  7. 10. the amount of effort exerted on a simple machine
  8. 11. for every action there is an equal and opposite reaction