Levers

Question 1

What are the 3 components of a lever?

Answer 1

1. Fulcrum
   - The joint (in most cases).
2. Resistance (Load)
   - The object you are lifting or the body itself.
3. Effort
   - The insertion point of the muscle which is contracting.

Question 2

Classification of levers

Answer 2

• There are 3 classification of levers:
• 1st class levers.
• 2nd class levers.
• 3rd class levers.

*How a lever is classified depends on which one of the three components (fulcrum, resistance, effort) is in the middle.

Question 3

What is the phrase to remember the levers by?

Answer 3

FRE-123

Question 4

What are 1st class levers?

Answer 4

AO1= the fulcrum is in the middle.
AO2= 1st class levers can only be found during:
- extension at the elbow.
- flexion & extension in the neck (nodding).

*go back and look over diagram drawing!!

Question 5

What are 2nd class levers?

Answer 5

AO1= the resistance is in the middle.
AO2= A 2nd class lever can only be found during:
- Plantarflexion at the ankle.
- Standing on your tip toes.

*go back and look at drawing!!!

Question 6

What are 3rd class levers?

Answer 6

AO1= the effort is in the middle.
AO2= 3rd class levers can be found in all the joints in the body, e.g.:
- flexion at the elbow.
- extension at the knee.

Question 7

Ads + Disads of 1st class levers

Answer 7

Advantages=
- Can produce quick movements.
- Large range of movement.

Disadvantages=
- Not able to lift heavy loads.

Question 8

Ads + Disads of 2nd class levers

Answer 8

Advantages=
- Able to lift heavy loads.

Disadvantages=
- Not able to produce quick movements.
- Small range of movement.

Question 9

Ads + Disads of 3rd class levers

Answer 9

Advantages=
- Can produce quick movements.
- Large range of movement.

Disadvantages=
- Not able to lift heavy loads.