Angular motion

Created by

Katie

Cards (12)

What is angular motion?
Movement of a body or part in a circular path about an axis of rotation
measured in radians
Creation of angular motion results in an eccentric force being applied to a body
An eccentric force is applied out the centre of mass = angular motion
A torque is a measure of the turning force applied to a body
What are the axis of rotation?
Longitudinal - Pivot in netball , Pirouette
Frontal - Cartwheel
Transverse - Somersault
What is angular velocity?
The rate of change in angular displacement
What is the equation for angular velocity?
Angular velocity = Angular displacement / Time taken
What is moment of inertia?
The resistance of a body to change its angular motion
What 2 factors affect moment of inertia?
Mass
Distribution of mass around the axis of rotation
What is the equation of moment of inertia?
moment of inertia = the sum of (mass x distribution of the mass from the axis of rotation 2)
What is angular momentum?
The quantity of angular motion possessed by a body this remains constant
What is the conservation of angular momentum?
Angular momentum is a conserved quantity - it stays constant unless acted on by an external force
A rotating body will continue in a state of constant angular momentum until acted upon by an external torque
A body in flight will rotate with constant angular momentum until landing
What factors affect the size of the moment of inertia of a rotating body?
Mass of the body
Distribution of mass around the axis of rotation
How does mass of the body affect the size of the moment of inertia of a rotating body?
The greater the mass the greater the resistance to change and therefore the greater the moment of inertia
How does the distribution of mass around the axis of rotation affect the size of the moment of inertia of a rotating body?
Decreasing the distribution of mass from the axis of rotation the easier it is to turn increasing angular velocity as moment of inertia is low