PAIREDREADMachinestoPushandPullInformationalTextbyBeverlyHarrisSTRATEGIES&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:923**Copyright©TheMcGraw-HillCompanies,Inc.Allrightsreserved.Nopartofthispublicationmaybereproducedordistributedinanyformorbyanymeans,orstoredinadatabaseorretrievalsystem,withoutthepriorwrittenconsentofTheMcGraw-HillCompanies,Inc.,including,butnotlimitedto,networkstorageortransmission,orbroadcastfordistancelearning.Sendallinquiriesto:McGraw-HillEducationTwoPennPlazaNewYork,NewYork10121ISBN:978-0-02-118892-5MHID:0-02-118892-0PrintedintheUnitedStates.12345678DOC171615141312PAIREDREADChapter1Forces................................2Chapter2FrictionatthePark...................6Chapter3FrictionandStopping................10Chapter4LessFriction.........................13RespondtoReading.................15MachinestoPushandPull..16Glossary/Index.......................19FocusonScience.............20EssentialQuestionHowdotheearth’sforcesaffectus?byBeverlyHarrisApushisaforcethatmakestheswingmove.Aforcepushesorpullssomething.Aforcehappenswhentwoobjectsinteract,orwhenoneobjectdoessomethingtotheother.ForcesaffecthowobjectsmoveonEarthandinspace.Forcesareatworkaroundyouallthetime.CHAPTER12MichaelNewman/PhotoEditPullingisaforcethatmakesthewagonmove.Youuseforcestomakethingsmoveeveryday.Whenyoupushonadoor,itswingsopen.Atthegrocerystore,acartmovesifyoupushit.Adoorclosesbehindyouwhenyoupullitshut.Whenyoupullonadrawerhandle,thedraweropens.3AndersonRoss/BlendImages/CORBISGravityisaforcethatpullsobjects.Youcan’tseegravity,butyouknowitisatwork.OnEarth,gravitypullsobjectstowardtheground.Gravitypullsyoud...
