Simple machine

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Across
  1. 4. A simple machine with to circular objects
  2. 5. An inclined plane wrapped around a spiral
  3. 8. A slanted surface
  4. 9. An inclined plane that moves
Down
  1. 1. The unit for work
  2. 2. The unit for distance
  3. 3. The unit for force
  4. 4. The unit for power
  5. 6. Simple machine with a grooved wheel
  6. 7. A simple machine with a bar that pivots