write down the principle of lever.
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Levers are classified by the relative positions of the fulcrum, effort and resistance (or load). It is common to call the input force the effort and the output force the load or the resistance.
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Principle of the Lever. It has been practically found that when two equal forces acting in opposite directions, i.e., clockwise and counterclockwise, are applied to a uniform lever at equal distances from the fulcrum, they counteract each other and establish a state of equilibrium in the lever.
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