What factors are related to the mechanical efficiency of leverage

What factors are related to the mechanical efficiency of leverage

According to the theory, the mechanical efficiency of the lever is related to the torque
According to the actual situation, the mechanical efficiency of the lever is related to its self weight, deformation degree, rotation angle, force direction and so on

What does the mechanical efficiency of leverage have to do with
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The self weight friction of the lever lifts the gravity of the object

What is the experimental principle of measuring the mechanical efficiency of moving pulley

Experimental principle: η = (W useful / W total) 100%