Component 1: Soc 20

Question 1

What are the parts of a lever?

Answer 1

• Lever arm: rigid bar such as bone
• Fulcrum: the point around a levers rotation
• Load: the force being moved by the lever
• Effort: the force applied to move the load

Question 2

What is the ordering of the 3 classes of levers?

Answer 2

• First class: Load, Fulcrum, Effort
• Second class: Effort, Load Fulcrum
• Third class: Fulcrum, Effort, Load

Question 3

What are mechanical advantages and disadvantages?

Answer 3

Mechanical advantage - when the output (load) of the lever is greater than the input (effort), first class and second class levers are advantages.
Mechanical disadvantage - when the output (load) of the lever is less than the input (effort). third class levers are disadvantages

Question 4

Give examples of first, second and third class levers.

Answer 4

First class - Tricep dip (the elbows the fulcrum, the hands the load and the triceps the effort)
Second class - Calf raise (the toes the fulcrum, the weights the load and the gastrocnemius is the effort)
Third class - Bicep curl (the elbows the fulcrum, the weights the hand and the biceps the effort)