angular Motion (3.2)

Question 1

What is angular motion?

Answer 1

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

Question 2

What is an eccentric force?

Answer 2

A force applied outside the COM resulting in angular motion

Question 3

What is torque?

Answer 3

A measure of the turning applied to a body

Question 4

What are the principal axis of rotation?

Answer 4

An imaginary line that passes through the COM about which a body rotates

Question 5

What is the longitudinal axis?

Answer 5

Runs from head to toe e.g. A flat spin on the ice

Question 6

What is the transverse axis?

Answer 6

Runs from left to right through the COM e.g, somersault

Question 7

What is the frontal axis?

Answer 7

Runs from front to back through the COM e.g. Cartwheel

Question 8

3 key descriptors in angular motion

Answer 8

Angular velocity
Moment of inertia
Angular momentum

Question 9

What is angular velocity

Answer 9

Rate of change in angular displacement ( rate of rotation)

Question 10

Formula angular velocity

Answer 10

Angular displacement/time = rad/s

Question 11

Moment of inertia formula

Answer 11

Sum of(mass x distribution of mass from axis of rotation ^2)
Kgm^2

Question 12

How does mass affect moment of inertia

Answer 12

Higher mass higher moment of inertia

Lower = good gymnasts

Question 13

How does distribution of mass affect moment of inertia

Answer 13

Further mass is away from axis of rotation the higher moment of inertia, tucking in decreases moment of inertia

Question 14

What is angular momentum

Answer 14

Quantity of angular motion possessed

Question 15

Angular momentum

Answer 15

Moment of inertia X angular velocity

Kgm2rad/s

Question 16

Conservation of angular momentum

Answer 16

Conserved quantity which remains constant unless external force or torque is applied