Machine Design
In levers, leverage is the ratio of

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

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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Make M/I constant throughout the length of the leaf
Have variable bending moment (M) in each leaf
Obtain variable moment of inertia (I) in each leaf
Permit each leaf to act as an overhanging beam

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