Lever System Flashcards
What is a lever
A rigid bar that moves about a fixed point when force is applied to it
What is the lever arm
The bone or body part being moved about a point
(Straight line)
What is the fulcrum
The joint where the lever arm pivots
(Triangle)
What is the effort?
The force applied by the muscles to the lever arm
(Arrow pointing in direction of the force)
What is the load
The force of the thing that you want to move
What is a 1st class lever system?
The load and effort are at opposite ends of the lever
(Fulcrum is in the middle)
What is 2nd class?
The fulcrum and effort are at the opposite ends of the lever
(Load is in the middle)
What is the 3rd class?
The fulcrum and load are at opposite ends of the lever
(Effort in the middle)
The equation for mechanical advantage?
Mechanical advantage = effort arm / weight (resistance) arm
