A Class 2 lever has the load positioned between the effort and the fulcrum. In the examples provided:
A. Tweezers plucking hairs - This is a Class 1 lever (fulcrum in the middle). B. Salad tongs picking up salad - This is also a Class 1 lever (fulcrum in the middle). C. A screwdriver opening a paint can - This is a Class 1 lever (fulcrum at the end). D. A car door being opened and shut - This is a Class 2 lever (load being the door itself rests between the fulcrum at the hinges and the effort applied at the door handle).
Therefore, D. A car door being opened and shut represents a Class 2 lever.
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