Forces, Simple machines, and motion

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Across
  1. 3. the amount of matter that an object or substance
  2. 5. occurs when an object changes position relative to a relative point,
  3. 7. the speed of an object and the direction of motion
  4. 9. the distance and object travels per unit time
Down
  1. 1. the rate of change of velocity
  2. 2. push or pull
  3. 3. device that makes doing work easier
  4. 4. machine, machine that does work with only one movement of the machine
  5. 6. si unit for measuring force
  6. 8. amount of gravitational force pulling on an object