Angular Kinetics

Translation

Lever Arm Length

Third Class Levers

Eccentric Force

Second Class Levers

Mechanical Advantage

Special Consideration

First Class Levers

Force that acts through the centre of a body.

A force whos line of action does not pass through the body's COG

Centre of Percussion

Translations and rotation cancel out at a given pivot point.

Fulcrum is located between the input effort and output load

Force acts between fulcrum and effort

Effort and load act on the same side of the fulcrum

95% levers in human body are 3rd class

Effort acts between fulcrum and effort

Effort and load act on the same side of the fulcrum

Resistance arm

Force (effort) arm

Distance between axis and point of resistance application

Distance between axis and point of force

<1: Small movement of the lever - moves the load through a large range of motion- velocity based

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Mech.Ad = Force (Effort) Arm / Resistance Arm

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Mech. Ad = 3

High mechanical advantage

Low Mechanical Advantage