— *Elizabeth Gire 2018/09/19 09:09*

# Review Angular Momentum

## Prompt

** “Write down something you know about angular momentum.” **

## Context

This SWBQ is meant to jog students' memories about what they know about angular momentum from introductory physics as preparation for understanding precession and Stern-Gerlach experiments.

## Wrap Up

Want:

- Vector
- Symbol is $\vec{L}$ or $\vec{S}$
- direction determined by a right hand rule (briefly demonstrate)
- same direction as the angular velocity
- Is conserved if net torque is zero
- $=I\vec{\omega}$
- $\tau_{net} = d\vec{L}/dt$ (prompt for this if none appear) (possible segue SWBQ about calculating torque)
- $=\vec{r}$ x $\vec{p}$ with picture (possible segue SWBQ about calculating cross products)
- Dimensions = energy * time = torque * time = length * momentum = mass length^2/ time

Be on the lookout for:

- confusion/connection with linear momentum
- missing vector symbols
- highlight multiple representations
- “Is conserved” (isn't unless net torque is zero)