simple machines

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Across
  1. 2. an inclined plane that is wrapped in a spiral
  2. 4. how fast work is done
  3. 7. efficiency a comparison of a machine's work output with the work input
  4. 8. planes a simple machine that is a straight slanted surface
  5. 10. a simple machine consisting of a bar that pivots at a fixed point
Down
  1. 1. a double inclined plane that moves
  2. 3. and axle a simple machine consisting of two circular objects of different sizes
  3. 5. advantage how many times the machine multiples force
  4. 6. a device that helps make work easier by changing the size or direction of a force
  5. 9. When a force causes an object to move in one direction of the force