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1、PhysicalScienceGenreComprehensionSkillTextFeaturesScienceContentNonfictionCauseandEffect•CaptionsSimple•ChartsMachines•DiagramsbyLillianDuggan•GlossaryScottForesmanScience6.16ì<(sk$m)=beabfc<+^-Ä-U-Ä-UISBN0-328-14015-514015_CVR_FSDCover105/27/052:14:07PMVocabularyWhatdidyoulear
2、n?Machinescompoundmachine1.Amachineused2newtonsofforcetopushabox100meters.Calculatehowmuchworkthemachinedid.effortforcebyLillianDugganfulcrum2.Howdosimplemachinesallowpeopletodoworkusinganeffortforcethatislessthantheload?loadmachine3.Supposeyouhavetomoveaheavyboxupaflightofsta
3、irs.Howwouldarampmakeyourjobeasier?simplemachine4.Someoftheeffortthatgoesintoaworkmachinegetswasted.Writetoexplainwhathappenstothiseffortandhowthelosscanbereduced.Includedetailsfromthebooktosupportyouranswer.5.CauseandEffectCarsaretooheavyforpeopletolift.Whatistheeffectofusing
4、acarjacktoliftacar?Illustrations:11–13PeterBollingerPhotographs:Everyefforthasbeenmadetosecurepermissionandprovideappropriatecreditforphotographicmaterial.Thepublisherdeeplyregretsanyomissionandpledgestocorrecterrorscalledtoitsattentioninsubsequenteditions.Unlessotherwiseackno
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