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A lever is a length of strong material like a pole or a pipe, that when moved a long way at one end, moves the other end a short distance, thus amplifying the force used to move the lever.
The point about which the lever moves is called "the Fulcrum". This needs to be a strong point that will not slip or crumble during use.
Levers can bend if they are not rigid enough, or even snap off if too much effort is used!
force1 x distance1 = force2 x distance2