Levers
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14 Terms
Importance of levers
optimally load muscle (usually reduce load)
estimates the amount of stress
What is a lever
rigid bar (bone) revolving about an axis (joint)
Lever mechanics
Mutually exclusive increase, can’t do more than one
Balance
Gain speed and range of motion (ROM
Gain force
Effort Force
What is winning - agonist
Resistance Force
What is losing - antagonist
Effort arm
distance between the effort force and the axis
Resistance arm
distance between the resistance force and the axis
Mechanical advantage
= effort arm / resistance arm
EA > RA
Favors force, 2nd class lever
RA > EA
Favors speed and ROM, 3rd class lever
most common lever in the body
EA = RA
Favors balance, 1st class lever (can also be speed and ROM OR force rather than balance)
1st class lever example
2nd class lever example
3rd class lever example
Note 
Flashcards (103)