Nolan Simple machines crossword

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Across
  1. 3. two machines combined to make one
  2. 5. A machine with two wheels that rotate
  3. 6. is the transfer of energy through motion
  4. 7. is an inclined plane with 2 sloping sides
Down
  1. 1. is an inclined plane that turns around a point
  2. 2. is a bar that is free to turn on a fixed point
  3. 4. a rope wrapped around a wheel
  4. 8. a measure of how much of the work is useful