Crane Crossword Puzzle

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Across
  1. 3. This system uses air to power objects
  2. 5. What is the physical pressure put on something called?
  3. 9. Why do we use machines to do stuff?
  4. 11. A car wheel uses these two simple machines. (one word)
  5. 12. The seesaw uses this simple machine.
Down
  1. 1. What force does an object project when it force is applied to it?
  2. 2. What is the crane classified as?
  3. 4. A ramp uses this simple machine.
  4. 6. What is the object that is being moved called?
  5. 7. This system uses water to power objects
  6. 8. What simple machine does a screw use?
  7. 10. An axe splitting wood uses this simple machine.