Angular momentum

Question 1

What is angular momentum?

Answer 1

• Angular momentum is rotation.
• It involves an object in motion around an axis.
• Angular momentum depends on 2 things.

Question 2

What 2 things does angular momentum depend on?

Answer 2

1. Moment of inertia
2. Angular velocity

Question 3

1. Moment of inertia

Answer 3

• The resistance of an object to change in state when rotating.

Question 4

2. Angular velocity

Answer 4

• The rate of movement in rotation.
• Basically how quickly something is rotating/ spinning.

Question 5

Equation for angular momentum

Answer 5

AM= Moment of inertia x Angular velocity

Question 6

The relationship between the ‘moment of inertia’ and ‘angular velocity’

Answer 6

• Both of these qualities are inversely proportional, and will always have an affect on one another.
• As one increases the other decreases at the same rate.
• Basically if something becomes more difficult to turn it will slow down.

Question 7

Moment of inertia

Answer 7

• The greater the inertia, the harder it becomes to rotate.
  Moment of inertia depends on 2 things:
  1. The Mass of an object
  2. The distribution of mass around the axis.
• The closer the mass is to the axis of rotation, the easier it is to turn- so the moment of inertia is low.
• The further the mass is to the axis of rotation, the harder it is to turn- so the moment of inertia is high.

Question 8

Angular momentum

Answer 8

• Angular momentum is a constant.
• It remains constant unless an external force acts upon it.
• Once an object is spinning the only thing that is going to stop it spinning is an external force such as air resistance or friction, otherwise it would spin forever.

Question 9

NEED TO KNOW!!!!

Answer 9

• Angular momentum remains constant.
• Angular momentum= moment of inertia x angular velocity.
• Moment of inertia and angular velocity are inversely proportional.
  Moment of inertia is effected by:
  1. The mass of an object.
  2. The distribution of mass around the axis.
• Change in moment of inertia results in a change of angular velocity.
• Angular velocity increases when moment of inertia decreases.
• Angular velocity decreases when moment of inertia increases.