levers, planes and axes Flashcards
what is a lever made of?
Bones, joints and muscles and soft tissue
functions of a lever
To generate muscular effort to overcome a given load, and to increase the speed of a given movement 
what is a lever?
A rigid bar that turns around an axis to create movement the force to move the lever comes from muscle 
what are the three parts of a lever?
Fulcrum, resistance and effort
what is the fulcrum?
fixed point where lever systems pivot
what is the resistance?
Theload moved usually involving weights 
What is the effort?
Force applied to move resistance provided by muscles 
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FRE
first class lever
Fulcrum is between effort and resistance, like the elbow during javelin 
Second class lever
the fulcrum lies at one end with the effort at the other end, like the ankle
third class lever
The fulcrum is located at one end, and the resistance is at the other end, like the elbow during a bicep curl
efficiency of a lever
Effort divided by weight
what increases mechanical avantage
a longer effort arm
sagittal axis
Goes through your stomach, side to side movement, abduction, adoption
transverse axis
Through the hips, forward or backward movement, extension and flexion