forces in motion

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Across
  1. 5. existing state of rest or uniform motion in a straight line
  2. 6. increase in the rate or speed of something.
  3. 10. forces applied to an object in opposite directions that are not equal in size.
  4. 11. to change the motion of a body
  5. 12. unit of force
  6. 14. for every action there is an equal and opposite reaction
Down
  1. 1. the resistance that one surface or object encounters when moving over another
  2. 2. the speed of something in a given direction
  3. 3. the rate at which someone or something is able to move or operate
  4. 4. law of inertia
  5. 7. equal in size and opposite in direction
  6. 8. unit of mass
  7. 9. law of Momentum
  8. 13. quantity of matter which a body contains