PHYS 10 - Lecture 13 - Rotational Motion, Torque, Angular Momentum, and Precession скачать в хорошем качестве

PHYS 10 - Lecture 13 - Rotational Motion, Torque, Angular Momentum, and Precession

In this thirteenth lecture in this 30-lecture set, we introduce *rotational motion**—the “spinning” version of the kinematics and dynamics ideas you already know. The key goal is to build intuition for what changes (and what stays the same) when we move from straight-line motion to rotation: angles instead of positions, angular speed instead of speed, and **torque* as the rotational version of “pushes and pulls.” We start with *rotational kinematics* (how to describe rotation using angle, angular velocity, and angular acceleration). Then we introduce *rotational inertia* (moment of inertia) as the idea that “mass distribution matters,” not just total mass. After that, we connect rotation back to what you already know by building **rotational analogs**—especially for kinetic energy and momentum—so the new ideas feel like an extension rather than a brand-new topic. Finally, we focus on one of the most surprising (and demo-friendly) outcomes of angular momentum: **gyroscopic precession**. We use demonstrations to show how torque and angular momentum vectors work together to produce precession, then close with a Q&A segment to consolidate the main takeaways and address common confusions. Topics in this lecture: • Rotational kinematics: angle, angular velocity, and angular acceleration • Rotational inertia (moment of inertia): why mass distribution matters • Rotational analogs: connecting linear ↔ rotational ideas (kinetic energy and angular momentum) • Angular momentum + torque: how rotation “responds” to a twist • Gyroscopic precession: demonstrations, intuition, and common questions Textbook (free, online on LibreTexts): https://coaphys.xyz/phys10book Recommended reading: Chapter 6 (Rotation) sections on rotational motion / angular momentum ────────── Lecture 13 of 30-ish in "Physics 10 in 30 Lectures" 0:00:00 - Lecture 13 Intro 0:02:25 - Chapter 6 Overview 0:16:38 - Intro to Rotational Kinematics 0:43:01 - Rotational Inertia Intro 0:51:43 - Rotational Analogs (kinetic energy and angular momentum) 1:13:24 - Angular Momentum and Precession Demos 1:21:38 - Torque and Angular Momentum 1:28:26 - Gyroscopic Precession Q&A ──────────