Simple machines

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Across
  1. 7. output force is between fulcrum and input force
  2. 8. Inclined plane wrapped in a spiral around a cylindrical post
  3. 11. machine that does work with only one movement of the machine
  4. 12. one end of the rope is fixed and the wheel is free to move
Down
  1. 1. two or more simple machines that operate togther
  2. 2. Fulcrum is in the middle
  3. 3. input force i between fulcrum and output force
  4. 4. attached to something that doesn't move
  5. 5. sloping surface
  6. 6. system of pulleys consisting of fixed and moveable pulleys
  7. 9. what fulcrum does
  8. 10. bar that is free to pivot around fixed point