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)

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