Simple Machines Crossword Puzzle

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Across
  1. 3. The unit of work
  2. 6. A machine that has two different simple machines
  3. 7. An inclined plane wrapped around a cylinder
  4. 9. A machine trades force for this
  5. 10. A circular lever
  6. 11. The unit of force
  7. 14. Mechanical Advantage of a single fixed pulley
  8. 15. A crowbar is this type of machine
Down
  1. 1. Another name for a ramp
  2. 2. The unit of distance
  3. 4. The force that opposes motion
  4. 5. A machine trades distance for this
  5. 7. The Number of Simple Machines
  6. 8. Two inclined planes back to back
  7. 12. Force times distance
  8. 13. Number without a unit