A rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied; -- used for transmitting and modifying force and motion. Specif., a bar of metal, wood, or other rigid substance, used to exert a pressure, or sustain a weight, at one point of its length, by receiving a force or power at a second, and turning at a third on a fixed point called a fulcrum. It is usually named as the first of the six mechanical powers, and is of three kinds, according as either the fulcrum F, the weight W, or the power P, respectively, is situated between the other two, as in the figures.
a rigid beam that can rotate about a fixed point. The point of rotation is the fulcrum or pivot. The fulcrum is the part of the lever that does not move. The idea of a lever is based on three things: effort or force; distance; and balance. The greater the distance between the lever and the fulcrum, the greater the load that can be moved. The longer the lever, the greater its mechanical advantage.