the fulcrum is located in the middle in a first class lever.
where is the fulcrum located in a first class lever?
in the middle
these cases are described by the mnemonic "fre 123" where the "f" fulcrum is in the middle for the 1st class lever, the "r" resistance is in the middle for the 2nd class lever, and the "e" effort is in the middle for the 3rd class lever.





























section::::law of the lever.





























the lever is a movable bar that pivots on a fulcrum attached to a fixed point. the lever operates by applying forces at different distances from the fulcrum, or a pivot.
lever
the lever is a movable bar that pivots on a fulcrum attached to or positioned on or across a fixed point. the lever operates by applying forces at different distances from the fulcrum, or pivot. the location of the fulcrum determines a lever's class. where a lever rotates, continuously, it functions as a rotary 2nd-class lever. the motion of the lever's end-point describes a fixed orbit, where mechanical energy can be exchanged. (see a hand-crank as an example.)
mechanical advantage