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Unformatted text preview: How Do We Describe Motion? Remarks Mastering Physics has an ebook button, which leads to a different book (Knight). This is o.k. You have a 2 nd code for the SU e book, accessible outside Mastering Physics. Labs start Mon Sep 12 Homework starts Mon Sept 5, due Mon Sep 12, 5pm Office hours will change somewhat To be announced on Blackboard Checking Understanding What is the 3 rd letter in the alphabet? How Do We Describe Motion? From last time: Adding Velocities Adding velocities Simple answer: as vectors But there is more to it Velocity relative to what? v v 2 v 1 v 1 v 2 v v 2 v 1 v Adding velocities A) Train at rest Ball: velocity v1 with respect to train v Adding velocities B) Train moving v v 2 v net Note: Always add (Velocity of ball with respect to train ) + (Velocity of train with respect to ground ) = (Velocity of ball with respect to ground ) Adding velocities C) Train moving v v 2 v net Adding velocities D) Train moving v v 2 v net Example: Crosswind Landing Velocity v of aircraft Velocity v2 of air mass with respect to ground (= cross wind) Velocity v net of air mass with respect to ground Replace: Ball with aircraft Train with air mass Checking Understanding In calm air on approach to landing an aircraft descends 50 m for every kilometer of forward motion. This corresponds to a 50 m for every kilometer of forward motion....
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 Fall '11
 Staff
 Physics, Work

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