🟠 5.0 Biomechanical Principles and Levers Flashcards
Fulcrum
The point at which the lever rotates
Resistance
The weight to be moved by the lever system
Effort
The force applied by the user (the muscle) of the lever system
Why are lever systems created by the body
To allow movement (the components of the body working together to generate movement)
First class lever system
Fulcrum lies between the effort and resistance
Only 2 examples of first class lever system
Tricep extensionn and flexion or extension of the neck
Second class lever system
Resistance lies between the fulcrum and effort
Only example of second class lever system
Plantar flexion at the ankle
Third class lever system
The effort lies between the fulcrum and the resistance
Examples of third class lever system
Everything that’s not tricep extension, neck, plantar flexion is third class
Mechanical advantage
When the effort arm is longer than the load arm. Meaning lever system can move large load over a shorter distance, requiring little force
Mechanical disadvantage
When the load arm is greater than the effort arm meaning the lever system cannot move as heavy a load but can do it faster
Acronym for lever systems
FLE
Lever systems and their mechanical adv/dis
First = either adv or dis as the fulcrum is in the middle so load and effort arm is same length
Second = adv because the load arm is shorter than the effort arm
Third = dis because the effort arm is shorter than the load arm
