美国物理教科书9.pdf

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1、228-235CH09-S1-8458133/19/044:59PMPage228WhatYou’llLearn•Youwilldescribemomentumandimpulseandapplythemtotheinteractionsbetweenobjects.•YouwillrelateNewton’sthirdlawofmotiontoconservationofmomentum.•Youwillexplorethemomentumofrotatingobjects.WhyIt’sImportantMomentumisthe

2、keytosuccessinmanysportingevents,includingbaseball,football,icehockey,andtennis.BaseballEverybaseballplayerdreamsofhittingahomerun.Whenaplayerhitstheball,atthemomentofcollision,theballandthebataredeformedbythecollision.Theresultingchangeinmomentumdeterminesthebatter’ssu

3、ccess.ThinkAboutThis
Whatistheforceonabaseballbatwhenahomerunishitoutofthepark?physicspp.com228fotobankyokohama/firstlight.ca228-235CH09-S1-8458133/10/0410:25PMPage229Whathappenswhenahollowplasticballstrikesabocceball?QuestionWhatdirectionwillahollowplasticballandabocce

4、ballmoveafterahead-oncollision?ProcedureCriticalThinkingWhatfactor(s)wouldcausethebocceballtomovebackwardaftercolliding1.Rollabocceballandahollowplasticballwiththehollowplasticball?towardeachotheronasmoothsurface.2.Observethedirectioneachonemovesafterthecollision.3.Repe

5、attheexperiment,thistimekeepingthebocceballstationary,whilerollingthehollowplasticballtowardit.4.Observethedirectioneachonemovesafterthecollision.5.Repeattheexperimentonemoretime,butkeepthehollowplasticballstationary,whilerollingthebocceballtowardit.6.Observethedirectio

6、neachonemovesafterthecollision.AnalysisWhatfactorsaffecthowfasttheballsmoveafterthecollision?Whatfactorsdeterminethedirectioneachonemovesafterthecollision?9.1ImpulseandMomentumtisalwaysexcitingtowatchabaseballplayerhitahomerun.The
ObjectivesIpitcherfiresthebaseballtowar

7、dtheplate.Thebatterswingsatthebase-•Definethemomentumofballandthebaseballrecoilsfromtheimpactofthebatathighspeed.anobject.Ratherthanconcentratingontheforcebetweenthebaseballandbatand•Determinetheimpulsetheirresultingaccelerations,asinpreviouschapters,youwillapproachthis

8、giventoanobject.collisioninadifferentwayinthischapter.Thefirststepinanalyzingthis•Definetheangulartypeofintera