Simple machines

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Across
  1. 2. the transfer of energy through motion
  2. 4. an inclined plane with one of 2 sloping sides
  3. 6. Fr/Fe =?
  4. 9. a sloping surface used to raise objects
  5. 10. a bar that is free to pivot or turn about a fixed point
  6. 11. a measure of how much work is used
Down
  1. 1. a machine that consists with two or more simple machines
  2. 3. a simple machine that consists of two wheels of different sizes that rotate together
  3. 5. a device that is used to make work easier with only one movement
  4. 7. a grooved wheels with a rope or chain running along the grove
  5. 8. an inclined plane wrapped in a spiral around a cylindrical post