8th grade forces

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Across
  1. 3. has a net force of zero
  2. 7. divided by time
  3. 8. when an object changes its position from a reference point
  4. 12. the friction experienced by an object moving through the air
  5. 14. an opposing force acting on two objects as they rub against each other
  6. 15. used to determine if an object is in motion
  7. 17. the name of the arrows in physics
  8. 18. speed in a given direction
Down
  1. 1. the force that pulls down on every object on earth
  2. 2. the amount of matter in an object
  3. 4. the rate at which speed increases
  4. 5. the sum of all forces acting on an object
  5. 6. has a nonzero netforce and causes a change in motion
  6. 8. the product of an objects velocity and mass
  7. 9. the measure of the force of gravity on an object
  8. 10. the unit of force
  9. 11. a push or a pull
  10. 13. an objects resistance to a change in its motion
  11. 16. an object that is thrown