7B-W11 Lecture 8-1

7B-W11 Lecture 8-1 - Physics 7B Sections A, B, C & D...

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Physics 7B Sections A, B, C & D Professor Lawrence B. Coleman 1 Lecture 8 – Angular Momentum, Torques, Center of Mass and Forces and Motion Physics 7B Winter 2011 - Lecture 8 Rhyme of the Week: “Round and around she goes, where she stops nobody knows.” Now we say … “Round and around she goes, where she stops a Physics 7B students knows” -- original from 1930’s radio show "Major Bowes Original Amateur Hour"
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Physics 7B Winter 2011 - Lecture 8 2 Quiz 3 Solutions and Rubrics posted Quiz 2 Grades Posted Quiz 2 A/B Average = 6.42 ( Std. Dev. = 2.09) Quiz 2 C/D Average = 6.96 ( Std. Dev. = 1.82) A/B Quizzes Average = 7.39 C/D Quizzes Average = 7.44 Useful info posted -- Table of I’s Dr. C was wrong !?! Announcements
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Physics 7B Winter 2011 - Lecture 8 3 Rotational Velocity = ω Right hand rule Moment of Inertia = I Depends on where all the mass is with respect to the axis of rotation. Angular Momentum = L= I ω Like p, it is conserved. Like p , L is a vector so direction matters. Right hand rule Quick Review of Lecture #7
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Physics 7B Winter 2011 - Lecture 8 4 IT’S A VECTOR, so direction matters. Interesting things when I changes The 3 dumbbells Falling cats – See videos on Smart Site Ice Skaters, Gymnasts, Divers et cetera Hurricanes Conservation of Angular Momentum
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5 Conservation of Angular Momentum
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7B-W11 Lecture 8-1 - Physics 7B Sections A, B, C & D...

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