### Lecture 23: Angular Momentum

**Objectives:**In this lecture, students will learn to

- define angular momentum of a particle and of a rigid rotating object
- relate torque to change in angluar momentum
- identify situations where the net torque equals zero
- apply angular momentum conservation to rotational collisions and explosions
- explain Kepler's 2nd Law in terms of angular momentum conservation

**Lecture Notes:**

- Powerpoint: lec23.pptx
- Pdf (recommended for printing): lec23.pdf

**Videos:**

Introduction | Video 1.mp4 | |

Angular momentum | Video 2.mp4 | with captions |

Conservation of angular momentum | Video 3.mp4 | with captions |

Demonstrations | Video 4.mp4 | with captions |

Example 1 | Video 5.mp4 | with captions |

Example 2 | Video 6.mp4 | with captions |

Example 3 | Video 7.mp4 | with captions |

Kepler's 2nd Law | Video 8.mp4 | with captions |

**Extras:**

Additional example problem | Video | with captions |

**Homework assignment:** HW #23