Simple machines

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Across
  1. 1. compound machine
  2. 3. lever
  3. 5. inclined plane
  4. 7. a flat surface tilted at an angle
  5. 8. a type of inclined plane
Down
  1. 2. a machine that makes work easier
  2. 4. a type of wedge
  3. 6. wheel and axle with a cable