Simple machine puzzle

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Across
  1. 4. a device that makes work easier
  2. 6. the transfer of energy through motion
  3. 7. how work is measured
  4. 8. a rope wrapped around a wheel
  5. 9. the amount of lever types
Down
  1. 1. a machine consisting of two wheels of different sizes that rotate together
  2. 2. a slanted surface or ramp
  3. 3. the number of simple machines there are lever a bar that is free to turn on a fixed point called a fulcrum.
  4. 5. an inclined plane that turns around a central point
  5. 6. an inclined plane with 2 sloping sides
  6. 7. the fixed point that the lever is supported.