byBeverlyHarrisPAIREDREADMachinestoPushandPullInformationalTextSTRATEGIES&SKILLSAPhotographyCredit:CoverImageSource/GaelConrad/CORBIS**Thetotalwordcountisbasedonwordsintherunningtextandheadingsonly.Numeralsandwordsincaptions,labels,diagrams,charts,andsidebarsarenotincluded.ComprehensionStrategy:RereadSkill:Author’sPurposePhonicsLonga:a,ai,ay,ea,ei,eigh,eyVocabularyStrategySimilesVocabularyamazing,force,measure,objects,proved,speed,true,weightContentStandardsSciencePhysicalScienceWordcount:352**Copyright©TheMcGraw-HillCompanies,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedordistributedinanyformorbyanymeans,orstoredinadatabaseorretrievalsystem,withoutthepriorwrittenconsentofTheMcGraw-HillCompanies,Inc.,including,butnotlimitedto,networkstorageortransmission,orbroadcastfordistancelearning.Sendallinquiriesto:McGraw-HillEducationTwoPennPlazaNewYork,NewYork10121ISBN:978-0-02-118936-6MHID:0-02-118936-6PrintedintheUnitedStates.12345678DOC171615141312Greer&Associates,Inc./SuperStockPAIREDREADWorkingTogether..........17EssentialQuestionHowdotheearth’sforcesaffectus?PAIREDREADMachinestoPushandPull..17GenreInformationalTextbyBeverlyHarrisMichaelNewman/PhotoEditAforcepushesorpullssomething.Forcescanmakeobjectsmove.Pushingisaforce.2AndersonRoss/BlendImages/CORBISYoupushadoor.Itopens.Youpulladoor.Itshuts.STOPANDCHECKWhatisaforce?Pullingisaforcetoo.3JuiceImages/CORBISGravitypullsthetomatoestowardtheground.Gravityisaforce.ItpullsobjectstoEarth.Dropapencil.Itfalls.Gravitypulledit.It’strue!Youprovedgravityworks!4RobSchusterFrictionslowsdownthemugwhenitispushed.Frictionisanotherforce.Frictionhappenswhentwothingsrubagainsteachother.Itmakesthingsmovemoreslowly.pushingforcefriction5GaelConrad/CORBISYoucanseefrictionwork.Visitapark.Watch.Agirlsitsonaslide.Gravitypullsherdown.Herclothesrubontheslide.Frictionchangesherspeed.Smooththings,likeaslide,makelessfrictionthanbumpythings.6Ocean/CORBISChildrenplaysoccer.Theykicktheball.Itrubsthegrass.Thismakesfrictionbetweenthegra...
