What is the Principle of the Lever in Physics

Principle of the Lever


In the lever the moment P acts opposite to that of work W. It means that force F tends to rotate the lever in one direction which the weight W rotates in opposite direction. If the magnitude of these moments acting in opposite direction is equal, then the lever will be in equilibrium. It means that:


Moment of P = Moment of W


Mechanical Advantage:


We know that according to Principle of Lever:


Moment of P = Moment of W


Force * Force Arm = Weight * Weight Arm


P * AB = WX BC





MA = W/P = AB/BC = Weight Arm/ Force Arm


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