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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
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 Physics, Work

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