Physics!

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