Soc 20 - Lever Systems

Question 1

What is a lever?

Answer 1

a system of muscles and bones working together to bring about movement

Question 2

How does a lever work?

Answer 2

It has four components:
Fulcrum
Effort
Load
Lever arm

Question 3

What are the different classes of levers?

Answer 3

First class levers
Second class levers
Third class levers

Question 4

First class lever

Answer 4

Fulcum is in middle - F
Load on left
Effort on right

Question 5

Second class lever

Answer 5

Load is in the middle - L
Effort to the left
Fulcrum to the right

Question 6

Third class lever

Answer 6

Effort is in the middle - E
Fulcrum to the left
Load to the right

Question 7

Example of a first class lever

Answer 7

Tricep dip

Question 8

Example of a second class lever

Answer 8

Calf raise

Question 9

Example of a third class lever

Answer 9

Bicep curl

Question 10

Mechanical advantage

Answer 10

A large load can be lifted with a relatively small amount of effort (applies to first and second class levers)

Question 11

Mechanical disadvantage

Answer 11

Third class levers cannot lift as heavy a load with the same amount of effort, due to the position of the effort and the load from the fulcrum