# Review Equations. Announcements 9/8/09. Table Tennis

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1 Announcemens 9/8/09 1. Course homepage ia: phsics.bu.edu Class web pages Phsics 105 (Colon J). (Class-wide sen) Iclicker problem from las ime scores didn ge recorded. Clicker quizzes from lecures 1 and will show up as 0 ou of 0 on our grade repor. The won coun agains our free clicker quizzes. 3. econd homework assignmen is due onigh a 11:59 pm. a. If ou missed he firs one, ou do ge hree free lae assignmens (all oher lae work is couned 50%). b. H 3 is due Thursda nigh. 4. am 1 sars Thursda! a. e ll finish up discussing some D kinemaics problems he firs half of Thursda lecure, hen do eam reiew for he second half of he lecure. 5. TA-led eam reiew session Thursda, 7:00-8:30 pm, in C-15 C Reiew quaions For consan acceleraion Three basic kinemaic equaions eloci-ime: posiion-ime: eloci-posiion: ae = 0 + a ( s. = sraigh line) + 1 = a ( s. = parabola) f 0 + f = 0 = + a Freefall: Penn & Feaher demo Milkdrop demo The Moing Man apple: hp://phe.colorado.edu/new/simulaions/sims.php?sim=the_moing_man Colon - Lecure 3 - pg 1 Colon - Lecure 3 - pg a b Table Tennis c e d Clicker quizzes: There is a lamppos a = 0. hich s cure describes: Q1. a car slowing down as i moes awa from he lamppos Q. a car moes oward he lamppos, bu slows down and urns around and speeds up Q3. a car speeding up as i moes oward he lamppos Q4. a car ha moes awa from he lamppos, urns around and passes he lamppos Ma Lin 008 Olmpic champion Quesion: ha is he direcion of he ball s acceleraion during he conac (hi) beween paddle and ball? A. righ B. lef C. zero Clicker quiz: ha is he direcion of acceleraion of he ball while raeling o he righ, and slowing down due o air resisance? (same choices) Clicker quiz: ha if he ball were ied o a bungee cord conneced o his paddle ha is he direcion of acceleraion a he insan he ball is sopped b he elasic and abou o sar coming back? (same choices) Colon - Lecure 3 - pg 3 Colon - Lecure 3 - pg 4

2 orked Problem: A rock is hrown upward off a cliff 30 m high, wih an iniial eloci of 0 m/s. a) How long does i ake o reach he op of is pah? b) ha is he eloci jus before i his he ground (30 m below he cliff)? c) How long does i ake o hi he ground? Remember PAuT Vecors: Magniude + Direcion amples: Veloci Acceleraion Displacemen? Posiion? (laer) Forces (in Phsics 106) lecric field, magneic fields More obscure: ind speed Hea flow c. Represened b Arrows Colon - Lecure 3 - pg 5 Colon - Lecure 3 - pg 6 Adding Vecors Graphicall: Tip o Tail Draw he firs arrow saring from he origin Begin he ne ecor saring wih is ail where he ip of he preious ecor leaes off: ip-o-ail Connec up more arrows he same wa, if ou hae addiional ecors o add. The sum is an arrow from he sar of he firs ecor o he end of he las ecor. ample: Add hese wo ecors orked Problem: A suden walks 100 m norh hen 00 m souh-eas. Find her final displacemen ecor relaie o he origin, graphicall. Guidance: A negaie ecor poins in he opposie direcion. Be sure all ecors are drawn o scale From warmup: I doesn' maer which order ou add wo ecors ogeher, ou will ge he same sum eiher wa. a. rue b. false Colon - Lecure 3 - pg 7 Colon - Lecure 3 - pg 8

4 Problem: A capain wans her boa o sail eacl on a map, wih a speed relaie o he earh of 10 mph. ha direcion should she poin her boa if here is a 5 mph curren o he? a. a lile bi norh of eas b. a lile bi eas of norh c. a lile bi souh of eas d. a lile bi eas of souh Hin: ar wih an approimae picure boa-earh = boa-waer + waer-earh D Moion: Basic Concep Moions in perpendicular direcions are independen -direcion = 0 + a 1 = a f = 0 + a How fas will he boa hae o go? -direcion = 0 + = f a a 0 = + a -D Projecile moion: a = 0 a = g projecile: an objec in free fall (= 9.8 m/s ) Colon - Lecure 3 - pg 13 Colon - Lecure 3 - pg 14 Demo: Car & ball Clicker quiz: ha will happen? A. Ball will land in fron of car B. Ball will land in back of car C. Ball will land in car all and Bob each hrow a rock horizonall from a cliff. all hrows her rock hard. Bob hrows his more easil. Clicker quiz: hich spends he longes ime falling? a. all s Demo: hooer & dropper ( balls: one sho & one dropped) Clicker quiz: ha will happen? A. Dropped ball will land firs B. ho ball will firs C. Two balls will land a same ime Clicker quiz: hich rock is going fases (ecor magniude) jus before i his he ground? a. all s Flash animaion: baseball eloci componens hp://sokes.bu.edu/baseball_flash.hml all hrows a rock horizonall from a cliff. Bob hrows his a an angle aboe horizonal. The hrow a he same speed. Clicker quiz: hich his firs? a. all s Colon - Lecure 3 - pg 15 Colon - Lecure 3 - pg 16

5 From warmup (if we hae ime): hich geomerical shape does a D projecile follow? a. line b. circle c. ellipse d. parabola e. hperbola h is ha? Video: Moorccle jumping oer airplane hp:// Colon - Lecure 3 - pg 17 Colon - Lecure 3 - pg 18

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