Simple Machines

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Across
  1. 1. Used for the maintenance of machines
  2. 4. fixed point in a lever
  3. 6. inclined plane wrapped around a plane
  4. 8. Class 1 lever used to cut objects like paper
Down
  1. 2. Class 2 lever used to crack open a walnut
  2. 3. used to lift sofa from ground floor to fourth floor
  3. 5. Class 3 lever used to pick up an object
  4. 7. reduces friction in machines and acts as lubricant