Que: What is the 1st class, 2nd class & 3rd class lever?

It uses a fulcrum in between, and the applied force and load are at opposite ends.
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The second class lever is one where the fulcrum is at one end, and the applied force at the other. The load that is to be moved is between them.
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The fulcrum is once again at one end of the lever, but this time the load is at the other end, and you apply a force in between.
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