I'm guessing a lever, but someone please re-answer this if I'm wrong.
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fulcrum
The rigid bar is not called a fulcrum! And, by the same token, why is the bar called a bar?
A lever. The fixed point is called the fulcrum.
A lever.
Fulcrum * * * * * The fulcrum is the fixed point. The bar is a lever. Admitedly, it would help if questions were asked properly.