Puzzle 20: Simple Machines

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Across
  1. 4. An inclined plane wrapped around a cylinder.
  2. 6. A tool that splits things apart.
  3. 8. A wheel with a rope used to lift objects.
  4. 10. The object being moved.
  5. 12. The force applied to move a load.
Down
  1. 1. The rod that a wheel turns on.
  2. 2. A flat surface tilted to raise objects.
  3. 3. Push or pull applied to an object.
  4. 5. A circular object that rotates around an axle.
  5. 7. Toothed wheel that transmits motion.
  6. 9. A rigid bar that pivots around a fulcrum.
  7. 11. Force applied over a distance.