Soc 20 - Levers Flashcards
How does a lever work?
A lever is a structure that has four components
-Fulcrum
-Load
-Effort
-Lever arm
What is the fulcrum?
The pivot around which the lever rotates
What is the load?
The force that is applied by the lever system (objects)
What is the effort?
A force that is applied by the user of the lever system (muscles)
What is the lever arm?
A rigid bar such as a bone
What is a 1st class lever?
Where Fulcrum is in the middle (FLE)
What is a 2nd class lever?
Where load is in the middle (ELF)
What is a 3rd class lever?
Where Effort is in the middle (FEL)
Explain a tricep dip?
The elbow is the Falcon which sits between the load (bodyweight) and the effort applied by the tricep.
Explain Nodding your head?
The neck joints (atlas and axis) is the fulcrum which sits between the load (head) and the effort applied by the neck muscle (sternocleidomastoid)
Explain Calf raises?
The body weight (load) sits between the toes and the ball of the feet (fulcrum) and the gastrocnemius muscles apply the effort by pulling the heel.
Explain lifting a wheel barrow?
The weight on the wheelbarrow your carrying is the load,which sits between the wheel (fulcrum) and the handle (effort)
Explain a bicep curl?
The effort is applied by the bicep,which is between the fulcrum at the elbow and the weight in your hands (load).
Explain using a spade?
The effort is applied by the foot(gastrocnemius) which is between the fulcrum at the handle and the weight of the soil (load).
Defenition of Mechanical advnatage?
A large load can be lifted with a relatively small amount of effort.
