Levers Flashcards
What is a lever?
The term ‘lever’ refers to a system of muscles and bones working together to help you move.
How do levers work?
When you exercise, your muscles pull on your bones, and your bones create movement, acting as levers.
What is the fulcrum?
The point around which the lever rotates.
What are the three components of a lever?
The fulcrum.
The load.
The effort.
Give an example of a load?
A dumbbell is the load if you are trying to do a bicep curl.
Give an example of the effort.
Your bicep working when completing a bicep curl.
What are the three classes of levers?
First class lever. Second class lever. Third class lever.
What are the advantages of a first class lever?
- stable.
- strong.
- increasing the length of the lever arm increases the mechanical advantage.
What are the disadvantages of first class levers?
- slow.
- limited flexibility.
What are the advantages of second class levers?
- stable.
- strong.
- increasing the length of the lever arm increases the mechanical advantage.
What are the disadvantage of second class levers?
- slow.
- limited flexibility.
What are the advantages of third class levers?
- fast movement.
- large range of motion.
- Increasing the length of the lever arm decreases the mechanical advantage.
What is the advantage of third class levers?
The force applied must always exceed the load.
What is a mechanical advantage?
A mechanical advantage is when a load can be moved with relatively small muscular effort.
What does the acronym ‘FLE’ mean?
Fulcrum is in the middle for a first class lever. Load is in the middle for a second class lever. Effort is in the middle for a third class lever.
