Introduction to Movement Analysis - Week 2

Question 1

What is centre of mass? (COM)

Answer 1

Defines the point at which the whole mass can be considered to be located. The point around which the mass and weight of a body are balanced.

Question 2

What factors can change the COM?

Answer 2

limb position, posture, objects

Question 3

What is the centre of gravity/line of gravity?

Answer 3

The line of action of the force of gravity. It is always directed downwards

Question 4

What is the base of support (BOS)?

Answer 4

An area defined by straight lines connecting the peripheral most points in contact with the surface.

Question 5

What is equilibrium?

Answer 5

Describes the state of a system that is not changing in its speed and direction.

Question 6

What is the difference between static and dynamic equilibrium?

Answer 6

Static: exist for a body at rest.
Dynamic: exists for a body that has unchanging speed or direction

Question 7

What is balance?

Answer 7

An individual’s ability to control equilibrium.

Question 8

What is stability?

Answer 8

The resistance to disruption of equilibrium. Stability varies with direction and is affected by forces and torque, body alignment, limb orientation

Question 9

What is the difference between linear and angular stability?

Answer 9

Linear: resistance to being moved in a straight line
Angular: resistance to being tipped over (angular motion)

Question 10

How do you increase linear stability?

Answer 10

• increase friction

- increase mass