3.2 - Biochemical Principles: Stability And Lever Systems

Question 1

What 4 factors affect stability?

Answer 1

Mass of the body
Height of the centre of mass
Base of support
Line of gravity

Question 2

What are the 4 components of the lever system?

Answer 2

Lever
Fulcrum
Effort
Load

Question 3

Describe the first class lever? Give an example?

Answer 3

Effort then fulcrum then load
Provides mechanical advantage
Example:
Extension of the neck when preparing to head a football

Question 4

Describe the second class lever? Give an example.

Answer 4

Fulcrum then load then effort
Provides mechanical advantage
Example:
Ball of foot in the take-off phase of a high jump

Question 5

Describe the third class lever system? Give an example.

Answer 5

Fulcrum effort load
Provides mechanical disadvantage
Example:
Performing a bicep curl

Question 6

What is mechanical advantage?

Answer 6

Where the effort arm is greater than the load arm

Question 7

What is mechanical disadvantage?

Answer 7

When the load arm is longer than the effort