p140w07_ct_08 - Racquetball Striking a Wall Copyright:...

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Physics 140: Winter 2007 Lecture #8 January 30, 2007 Dave Winn Racquetball Striking a Wall Copyright: Loren M. Winters Mt. Etna Andrew Davidhazy
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1 st exam information • First exam: Thursday Febuary 1st from 6:00-7:30 PM • We will start promptly • Bring a calculator • Bring a 3”x5” card with whatever you want to remember (both sides OK) Room Assignments – Uher: Angel Hall aud C – Bechetti: 1400 Chem – Skalsey: 1800 Chem – Cole: 1800 Chem – Bobkov: 170 Denn – Winn: 182 Denn
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Motion in more than one dimension • Second law in vector form: • Velocity changes are in the direction of the force • Any component of velocity perpendicular to the force is unchanged • We are considering two special cases of 2D motion: • Projectile motion: force always in one direction – One component of motion “uniform and perpetual” – One component feels a constant force • Uniform circular motion – Force always perpendicular to the motion: speed is unchanged dt v d m a m F r r r = = Σ
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Realistic projectile motion with air friction Barry Bonds hits a baseball at 120 mph at a 45 ° angle. If there were no air friction it would travel around 910 feet! Barry Bonds hits a baseball at 120 mph at a 45 ° angle. With air friction it instead travels only around 490 feet… v r g m r air F r Air friction is always opposite motion!
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Another special 2D motion • Uniform circular motion, another special case of 2D motion • Object traveling at constant speed on a circle needs a force of fixed size, always to motion, to keep moving in a circle F r v r v r F r v r F r v r F r
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This note was uploaded on 04/04/2008 for the course PHYSICS 140 taught by Professor Evrard during the Fall '07 term at University of Michigan.

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p140w07_ct_08 - Racquetball Striking a Wall Copyright:...

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