(a rigid segment); the bones are assumed to be rigid, while in reality they're not
the joint; the center of motion and location of the axis of motion
the pull of a muscle
the weight being moved (can be a body part)
the ease with which the resistance can be moved
Longer lever arm of the force
less force is needed to move the resistance
Longer lever arm of the resistance
more force is needed to move the resistance
First Class Levers
Fulcrum is located between the force and the resistance
Second Class Levers
Force and Resistance are on the same side of the fulcrum; resistance is closer to the fulcrum; better advantage
Third Class Levers
Force and Resistance are on the same side of the fulcrum; force is closer to the fulcrum; better mobility
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