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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 net v 2 v 1 v 1 v 2 v net v 2 v 1 v net Adding velocities A) Train at rest Ball: velocity v1 with respect to train v 1 Adding velocities B) Train moving with v 2 (to right) Ball: velocity v 1 with respect to train Train: velocity v 2 with respect to ground Ball: velocity v net with respect to ground v 1 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 with v 2 (to right) Ball: velocity v 1 with respect to train , but sideways Train: velocity v 2 with respect to ground Ball: velocity v net with respect to ground v 1 v 2 v net Adding velocities D) Train moving with v 2 (to right) Ball: velocity v 1 with respect to train , but diagonally backwards Train: velocity v 2 with respect to ground Ball: velocity v net with respect to ground v 1 v 2 v net Example: Crosswind Landing...
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 Fall '11
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