simple machines

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Across
  1. 5. 2 sloping sides
  2. 6. sloping surface
  3. 8. where an objects energy is put
Down
  1. 1. consists of a axle attached to a wheel
  2. 2. pivots around a fixed point
  3. 3. inclined plane wrapped in a spiral
  4. 4. the fixed point
  5. 7. grooved wheel with a rope