Movement Analysis Flashcards
LEVERS
Why does the body need levers and what are they
To create all the movements of the body
They’re a rigid bar that turns about an acid to create movement
What are the 3 types of levers
And what do they all use
First second and third class levers
The fulcrum
The load
The Effort
What is the fulcrum
The point at which the levers turns or supported
What is the load
The weight or resistance a lever must move
What is the effort
The force required to move the Load and in the body this comes from the muscles
What is the structure of a first class lever
The fulcrum is midway bettween the effort and load and is quite close to both
What’s the structure of a second
Class lever
What does this mean
The load is now between the fulcrum and effort
This means large pads can be lifted with littykw effort
What is the structure of the third class lever What does this mean
The effort is now placed between fulcrum and load
This means they can produce large range of movement with low effort
Mechanical advantage
What does load arm mean
The distance from load to fulcrum
Mechanical advantage
What does effort arm mean
The distance from Effort to fulcrum
What does mechanical advantage measure and how is it done
The efficiency of a lever
Effort arm/load arm
When is a lever at mechanical advantage
When an effort arm is longer than its load arm
What can levers with high mechanical advantage do
Move loads which relatively low effort
What two levers have usually low mechanical advantages
Third and first class levers
How can a first class lever have high and low mechanical advantage
Low = if fulcrum is class to load High= if fulcrum is closer to effort
