AOS2 Chapter 3 (Biomechanics)

Question 1

What is a force and what are types of forces?

Answer 1

Force is a push or a pull

• Gravity
• Friction
• Air and water resistance

Question 2

What is gravity?

Answer 2

• Constant force that acts through the centre of mass of an object towards the earth.

Question 3

What is friction?

Answer 3

• Occurs when 2 surfaces come in contact with each other.
• Less friction, skiing to increase movement speed in the snow
• Increase friction, metal studs in wet conditions to increase grip

Question 4

What is air and water resistance and what can affect this?

Answer 4

• A drag force created by movement in air or water, affected by:
• Speed of object
• Amount of surface area facing the water or air

Question 5

What is impulse?

Answer 5

• To change the momentum of an object

- Force must be applied over time to an object to change this

Question 6

What is momentum?

Answer 6

• A measure of the amount of motion an object has

- Mass times velocity

Question 7

What is angular momentum and how is it conserved?

Answer 7

• The quantity of angular motion of a body

- This is often conserved when the body is within flight

Question 8

What is angular velocity?

Answer 8

• The rate of change of angular displacement over time

Question 9

What is angular motion?

Answer 9

• Movement of a body part around an axis of rotation

Question 10

What is moment of inertia?

Answer 10

• The resistance of an object to change its angular motion

Question 11

What is inertia?

Answer 11

• The tendency of a body to resist to change whether being stable or in constant velocity