Lever
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A lever is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum. A lever is a rigid body capable of rotating on a point on itself. On the basis of the locations of f
Levers can be used to exert a large force over a small distance at one end by exerting only a small force (effort) over a greater distance at the other.
Archimedes lever, Engraving from Mechanics Magazine, published in London in 1824
Simple lever, fulcrum, and vertical posts
Le Mecaniche
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Le Mecaniche is a short treatise by Galileo Galilei, composed while he was teaching mathematics in Padua. The precise date of its most refined form is difficult, if not impossible, to determine, but i
Steelyard weighing device from the late nineteenth century.
A simple pulley ABC in which a weight E is lifted by a force F.
A single movable pulley BDC supports a weight G. A cord ABDCF wrapped around pulley BDC is anchored at A, and a force applied at F pulls upwards, thus raising pulley BDC and the weight G, functioning as a class II lever.