# How does moment of inertia affect angular velocity?

##### 1 Answer

Oct 22, 2015

#### Answer:

Like this:

#### Explanation:

The expression for angular momentum is:

Where

Angular momentum is conserved so if

The skater in the graphic has utilised this principle. She brings in her arms to decrease her moment of inertia. As a result her angular velocity has increased i.e she spins faster.