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Lever
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This article is about the simple machine. For other uses, see
Lever (disambiguation).
Lever
Levers can be used to exert a large force over a small distance at one end by exerting only a small force over a greater distance at the other.
Classification
Simple machine
Industry
Construction
In
physics, a lever (from
French lever, "to raise", cf. a
levant) is a rigid object that is used with an appropriate fulcrum or
pivot point to either multiply the mechanical force (effort) that can be applied to another object or resistance force (load), or multiply the distance and speed at which the opposite end of the rigid object travels. This leverage is also termed
mechanical advantage, and is one example of the
principle of moments. A lever is one of the six
simple machines.
Contents
Early use
The earliest remaining writings regarding levers date from the 3rd century BC and were provided by is a remark of Archimedes who formally stated the correct mathematical principle of levers (quoted by Pappus of Alexandria).
It is assumed that in ancient Egypt, constructors used the lever to move and uplift obelisks weighting more than 100 tons.
Force and levers
The force applied (at end points of the lever) is
proportional to the ratio o...
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