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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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