Physics!

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Across
  1. 4. responsible for change in momentum
  2. 8. velocity where the air resistance is equal to the object's weight
  3. 9. for every action there is an equal and opposite
  4. 12. kilograms meters per second squared
  5. 13. responsible for causing acceleration
  6. 15. a property of matter by which it continues in its existing state of motion
  7. 16. gravity is responsible for this force
  8. 17. force and time proportionality
Down
  1. 1. unit for mass
  2. 2. quantity that has magnitude and direction
  3. 3. quantity that has magnitude and no direction
  4. 5. force and acceleration proportionality
  5. 6. collision where objects bounce off one another
  6. 7. collision where objects stick together
  7. 10. decreases as mass increases
  8. 11. the quotient of momentum and mass
  9. 14. the product of mass and velocity
  10. 18. object at rest or moving at constant velocity