Machines

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Across
  1. 4. inclined plane with 1 or 2 sloping sides
  2. 5. the unit for work
  3. 7. grooved wheel with a rope, chain or cable running along the groove
  4. 9. never changes
  5. 10. a device that makes life easier
Down
  1. 1. inclined plane wrapped in a spiral
  2. 2. advantage the ratio of the output force to the input force
  3. 3. a bar that is free to pivot around a fixed point
  4. 6. fixed point that a bar pivots on freely
  5. 7. the rate at which work is done
  6. 8. machine 2 or more simple machines that operate together