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, so less work is done on the load. Due to conservation of energy, the sum of the output work and the frictional energy losses is equal to the input work
:Therefore, more input force is required, and the mechanical advantage is lower, than if friction were not present.With friction, the load will only move if the net force parallel to the surface is greater than the frictional force opposing it. The maximum friction force is given by
:where is the normal force

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