Soc20 Levers

Question 1

What is a lever?

Answer 1

the term ‘lever’ refers to a system of muscles and bones working together to bring about movement.

Question 2

What are the 4 components of a lever?

Answer 2

1) Fulcrum - (or pivot) - the point around which the lever
rotates (joints).
2) Load - the force that is applied by the lever system
(resistance/ object).
3) Effort - a force that is applied by the user of the lever
system (muscles).
4) Lever arm - a rigid bar such as a bone.

Question 3

What inages represent each part?

Answer 3

Fulcrum - Triangle
Load - Square
Effort - Arrow
Lever arm - Line / stick

Question 4

What are the 3 types of levers?

Answer 4

First class levers
Second class levers
Third class levers

Question 5

What is the acronym to remember the levers?

Answer 5

FLE
F- Fulcrum, L- Load, E- Effort

Question 6

Examples of first class levers?

Answer 6

Tricep dip
Nodding your head

Question 7

Examples of second class levers?

Answer 7

Calf raises
Lifting a wheelbarrow

Question 8

Examples of third class levers?

Answer 8

Bicep curl
Using a spade

Question 9

Mechanical advantages?

Answer 9

Definition: A large load can be lifted with a relatively small amount of effort.
This happens when the output of the lever is greater
than the input - the load is greater than the effort, so you are getting more out than you are putting in.
First and second class levers both work at a mechanical advantage.

Question 10

Mechanical disadvantages?

Answer 10

Definition: Third class levers cannot lift as heavy a load with the same amount of effort, due to the position of the effort and load from the fulcrum.
This happens when the effort and the load are both the same side of the fulcrum but the effort sits closer to the fulcrum than the load does.
The input of the lever is greater than the output - the force you apply is greater than the load so you are putting in more than you are getting out.
Third class levers work at a mechanical disadvantage.