Simple Machine

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Across
  1. 3. rod used to do work
  2. 5. put a lever against to shift a boulder
  3. 6. central point of a seesaw
  4. 7. found on vehicles
  5. 8. ramps and roller coasters
  6. 9. bigger than it is
Down
  1. 1. found on a screw
  2. 2. used to lift an elevator
  3. 4. object with no moving parts
  4. 5. two surfaces rubbing
  5. 7. forces things apart
  6. 10. holds wheels