Lever

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Diagram of the use of a first-class lever (blue) on a fulcrum (brown)
Diagram of the use of a first-class lever (blue) on a fulcrum (brown)
Diagram of the use of a second-class lever (blue) on a fulcrum (brown)
Diagram of the use of a second-class lever (blue) on a fulcrum (brown)
Diagram of the use of a third-class lever (blue) on a fulcrum (brown)
Diagram of the use of a third-class lever (blue) on a fulcrum (brown)

A lever is scientific term for something generally used in physics. A lever is something that can be uses by a lot of ways and this is one way by measuring things and by seeing which weighs more and (or) less.A lever is supported by a fulcrum which it uses to lifts weights.