Forces and motion

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Across
  1. 2. unit for movement shows direction
  2. 3. change in position
  3. 7. base of all motion
  4. 8. a distance that something travels in one unit of time
  5. 12. momentum cant be stopped or made without outside force
  6. 14. a push or a pull
  7. 16. the measurement of the force of gravity on an object
Down
  1. 1. friction on a force that is not moving
  2. 4. all forces combined acting on something
  3. 5. friction on a rolling object
  4. 6. a type of physical interaction between electrically charged particles
  5. 9. speed or rate of travel in a certain direction
  6. 10. 12 letter word that's part of Newtons second law
  7. 11. resistance to stopping or going
  8. 13. how much space something takes up
  9. 15. mass attracted to mass