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Published bySuzan Newman Modified over 8 years ago
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11/22 Rotation and Torque Today: Rotational Dynamics HW “Pulling the Wheel” Due Wednesday 11/27 Class canceled 12/2, Not this coming Monday!
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It’s all the same! v ave = x/ t ave = / t a = v/ t = / t t = 2 x/a t = 2 / About DistanceAbout Angles F net = ma net = I The quantity “I” is the “moment of inertia” and will be given to you. KE T = 1 / 2 mv 2 KE R = 1 / 2 I 2 Work T = F x Work R =
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Measuring Angles, Radians One Rad of rotation = one radius of translation (rolling without slipping and strings wrapped around pulleys) x = r v = r v = r v ave = ave r a = r 1 Rad 1 radius (r) r r
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Example A wheel with I = 5kg m 2, is mounted on a frictionless axle. A rope wrapped around its outer rim is pulled with a force T = 50N for a distance of 2m. Find everything, starting with . 2m r = 0.5m Not necessarily a disk or ring, the quantity “I” contains that information
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