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{{Mergefrom|Resistance distance|date=February 2007}}
[[Image:LeverPrincleple.svg|thumb|200px|The principle of the lever tells us that the above is in [[static equilibrium]], with all forces balancing, if F<sub>1</sub>D<sub>1</sub> = F<sub>2</sub>D<sub>2</sub>.]]
In [[physics]], a '''lever''' (from [[Old French] the agent noun to ''lever'' "to raise", c. f. ''[[levant]]'') is a rigid object that is used with an appropriate fulcrum or pivot point to multiply the mechanical force that can be applied to another object. This is also termed [[mechanical advantage]], and is one [[maple story|example]] of the [[principle of moments]]. The principle of leverage can also be derived using [[Newton's laws of motion]], and modern [[statics]]. It is important to notice that the amount of [[work]] done is given by force times distance. The lever allows less effort to be expended to move an object a greater distance. For instance, to use a lever to lift a certain unit of weight with an effort of half a unit, the distance from the fulcrum of the spot where force is applied must be twice the distance between the weight and the fulcrum. For example, to halve the effort of lifting a weight resting 1 metre from the fulcrum, we would need to apply force 2 metres from the other side of the fulcrum. The amount of work done is always the same and independent of the dimensions of the lever (in an ideal lever). The lever only allows to trade effort for distance. Levers are one of the six [[simple machine]]s
==Early studies==
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