2.1 Lever Systems

Question 1

What are the four parts to a lever?

Answer 1

1. Effort
2. Fulcrum
3. Load
4. Lever arm

Question 2

What is in the middle of a first class lever?

Answer 2

The fulcrum

Question 3

What is in the middle of a second class lever?

Answer 3

The load

Question 4

What is in the middle of a third class lever?

Answer 4

The effort

Question 5

Name the 2 first class levers in the body?

Answer 5

The neck - tilting backwards

Elbow extension

Question 6

Name the 1 second class lever in the body?

Answer 6

Plantar flexion

Question 7

Name the third class levers in the body?

Answer 7

All movements apart from

• neck
• elbow extension
• plantar flexion

Question 8

What are the advantages of a first class lever?

Answer 8

Large load can be lifted with a small amount of effort

Question 9

What are disadvantages of a first class lever?

Answer 9

Limited flexibility

Slow movements - not good for generating power

Question 10

What are the advantages of a second class lever?

Answer 10

Large load can be lifted with a small amount of effort

Question 11

What are the disadvantages of a second class lever?

Answer 11

Limited flexibility

Slow movements - not good for generating power

Question 12

What are the advantages of a third class lever?

Answer 12

Fast movement

Large range of movement

Question 13

What are the disadvantages of a third class lever?

Answer 13

A large amount of effort is required

Question 14

What is meant by the term ‘mechanical advantage’?

Answer 14

The effort required is less than the load

Question 15

What is meant by the term ‘mechanical disadvantage’?

Answer 15

The effort required is greater than the load

Question 16

Which class of lever work with a mechanical advantage?

Answer 16

First and second class

Question 17

Which class of lever work with a mechanical disadvantage?

Answer 17

Third class