Levers

Question 1

What are the 3 components of a lever?

Answer 1

Fulcrum, resistance (load) and effort

Question 2

What is the fulcrum in most cases?

Answer 2

The joint

Question 3

What is the resistance?

Answer 3

The object you are lifting or the body itself

Question 4

What is the effort?

Answer 4

The insertion point of the muscle which is contracting

Question 5

How are levers classified?

Answer 5

Into 1st class, 2nd class and 3rd class levers

Question 6

What classifies a lever?

Answer 6

Which component is in the middle

Question 7

What is the rhyme to remember which component is in the middle for each classification?

Answer 7

FRE-123

Question 8

What is a 1st class lever?

Answer 8

The fulcrum is in the middle

Question 9

Where can 1st class levers only be found?

Answer 9

• Extension in the elbow
• Flexion and extension in the neck

Question 10

What is a 2nd class lever?

Answer 10

The resistance is in the middle

Question 11

Where can a 2nd class lever only be found?

Answer 11

• Plantarflexion at the ankle

Question 12

What is a 3rd class lever?

Answer 12

The effort is in the middle

Question 13

Where can 3rd class levers be found?

Answer 13

All joints in the body
- Flexion in the elbow
- Extension in the knee