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Angular Kinetics (Third Class Levers (95% levers in human body are 3rd…
Angular Kinetics
Third Class Levers
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
Low Mechanical Advantage
Mechanical Advantage
<1: Small movement of the lever - moves the load through a large range of motion- velocity based
Mech.Ad = Force (Effort) Arm / Resistance Arm
Second Class Levers
Force acts between fulcrum and effort
Effort and load act on the same side of the fulcrum
High mechanical advantage
Lever Arm Length
Resistance arm
Distance between axis and point of resistance application
Force (effort) arm
Distance between axis and point of force
Eccentric Force
Special Consideration
Centre of Percussion
Translations and rotation cancel out at a given pivot point.
A force whos line of action does not pass through the body's COG
First Class Levers
Fulcrum is located between the input effort and output load
Mech. Ad = 3
Translation
Force that acts through the centre of a body.