Simple Machine

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Across
  1. 4. 1 gear system
  2. 5. many class lever systems are there
  3. 6. formula for the mechanical advantage of an inclined plane is
  4. 7. of class 3 lever
Down
  1. 1. is the fulcrum in the class 3 lever
  2. 2. of the simple machines
  3. 3. simple machine
  4. 8. example where gears are used