7. the Six Simple Machines

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Across
  1. 4. Flat, slanted surface
  2. 5. Anything that cuts or splits things apart
  3. 6. A bar that is free to rotate around a fixed point called a fulcrum
Down
  1. 1. Made up of a wheel concreted to a post
  2. 2. A wheel with a groove down the middle
  3. 3. A cylinder with an inclined plane wrapped around it