# Lect19 - Physics 101 Lecture 19 Rotational Dynamics q...

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Physics 101: Lecture 19, Pg 1 Physics 101: Lecture 19 Lecture 19 Rotational Dynamics Today’s lecture will cover Textbook Chapter 9 Concept Questions and Example Problems More on Angular Momentum and Conservation of Angular

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Physics 101: Lecture 19, Pg 2 See text: chapters 8-9 See Table 8.1 Angular Momentum Angular Momentum Momentum Angular Momentum p = m v L = I ϖ conserved if Σ F ext = 0 Στ =0 Vector Vector! units: kg m/s kg m 2 /s
Physics 101: Lecture 19, Pg 3 Concept Question You are sitting on a freely rotating bar-stool with your arms stretched out and a heavy glass mug in each hand. Your friend gives you a twist and you start rotating around a vertical axis though the center of the stool. You can assume that the bearing the stool turns on is frictionless, and that there is no net external torque present once you have started spinning. You now pull your arms and hands (and mugs) close to your body.

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Physics 101: Lecture 19, Pg 4 Concept Question What happens to your angular momentum as you pull in your arms? 1. it increases
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Lect19 - Physics 101 Lecture 19 Rotational Dynamics q...

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