Simple Machines

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Across
  1. 6. is a slanted surface or ramp
  2. 7. two wheels of different sizes that rotate together
  3. 8. fr/fe
  4. 9. de/dr
  5. 10. a bar that is free to turn on a fixed point
Down
  1. 1. a machine that combines two or more simple machines
  2. 2. is a rope wrapped around a wheel
  3. 3. is an inclined plane with 2 sloping sides instead of one
  4. 4. a device that makes work easier
  5. 5. an inclined plane that turns around a central point