Angular Motion & Angular Momentum Flashcards
What is angular motion?
Angular motion is the movement around an axis and is caused by an eccentric force (a force applied outside to the centre of gravity)
Torque = Force x Moment Arm (where you apply the force)
What is angular momentum?
Angular momentum is the quantity of rotation of a body around an axis.
Angular Momentum = Moment of Inertia (mass x radius^2) x Angular Velocity
An object with greater angular momentum will be harder to stop rotating
What is moment of inertia?
Moment of inertia is a measure of an objects reluctance to rotate.
Moment of Inertia (MOI) = Mass x Radius^2
What is the conservation of angular momentum?
When airborne there is no external force acting on an object and therefore there will be no change in angular momentum
Therefore, a decrease in MOI will result in an increase in angular velocity. And hence, an increase in MOI will result in a decrease in angular velocity.
