3.2 - Angular Motion

Question 1

What is angular motion?

Answer 1

Movement of a body or a part of a body in a circular path above an axis of rotation

Question 2

What type of force causes angular motion to occur?

Answer 2

An external force passes outside the centre of mass
Eccentric force
(Torque)

Question 3

What are the 3 principle axes of rotation?

Answer 3

Longitudinal - head to toe through centre of mass - pirouette
Transverse - left to right through centre of mass- somersaults
Frontal - front to back through centre of mass - cartwheel

Question 4

What are the 3 angular motion descriptors?

Answer 4

Angular velocity
Moment of inertia
Angular momentum

Question 5

What is angular velocity? How is it measured?

Answer 5

Is the rate of change in angular displacement

Angular velocity = angular displacement / time taken

Question 6

What is moment of inertia?

Answer 6

Resistance of a body to change its state of angular motion

Question 7

What are the 2 factors that affect moment inertia?

Answer 7

Mass
Distribution

Question 8

If moment inertia is high how does it affect angular velocity?

Answer 8

If moment inertia is high, angular velocity is low

Resistance to rotation is also high, rate of spin is low

Question 9

If moment inertia is low how does it effect angular velocity?

Answer 9

If moment inertia is low, angular velocity is high

Resistance to rotation is low, rate of spin is fast

Question 10

What is angular momentum?

Answer 10

Quantity of angular motion possessed by a body

Question 11

What’s the equation for angular momentum?

Answer 11

Angular momentum = moment of inertia x angular velocity

Question 12

What is conservation of angular momentum?

Answer 12

Angular momentum is a conserved quantity which remains constant unless an external eccentric force or torque is applied