# lec17 - Physics 140 Fall 2007 1 November lecture#17 Ch 10...

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Midterm exam #2 is tonite, 6-7:30 pm bring two 3x5 notecards, calculator, #2 pencils Physics 140 – Fall 2007 1 November: lecture #17 7, 8, 9, 25, 26, 27 Angell Hall Aud A 13, 14, 15 Angell Hall Aud D 10, 23, 24 Angell Hall Aud B 4, 5, 6, 11, 12 MLB AUD 3 Discussion Sections Midterm Exam Location Ch 10 topics: rolling dynamics mechanical energy of rolling

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Score distribution of practice exam
A wheel rolls along without slipping to the right. As viewed from your seat in the lecture hall, what is the velocity of point P? 1. 2. 3. 4. P v com

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Rolling results from combined actions of linear and angular motion. When a wheel rolls without slipping - Rolling The axle traces the center of mass motion v axle = v cm . Points on the rim rotate around the (moving axle with angular speed ω = v cm / r . The vector sum of these velocity fields is what’s seen from the ground. + =

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The case of rolling without slipping, starting from rest, along an incline is shown here. Dots are separated by equal time intervals. Rolling is efficient
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lec17 - Physics 140 Fall 2007 1 November lecture#17 Ch 10...

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