# Classical Angular Momentum

From introductory physics: some familiarity with angular momentum, torque, Newton's 2nd law for rotations, vector cross product, dot product, gradient.

## In-class Content

### Demo: Bicycle Wheel Precession

Equipment: Bicycle wheel with rope

## Homework

1. A particle moves under the influence of a central force directed toward a fixed origin $O$.

1. Give a Conceptual Explanation: Why is the angular momentum about $O$ constant for the particle? (Remember, conceptual explanations can and should include equations and diagrams.)

2. Give a Conceptual Explanation: Why must the particle’s orbit make a plane containing $O$?

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