Machine Design
In levers, leverage is the ratio of

Mechanical advantage to the velocity ratio
Effort arm to the load arm
Load arm to the effort arm
Load lifted to the effort applied

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of transverse shear stress and curvature of wire
Combined effect of torsional shear stress and transverse shear stress in the wire
Combined effect of transverse shear stress and bending stress in the wire
Combined effect of bending stress and curvature of the wire

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