(2a) 2021 BBSS O PRELIM Sec 4E Pure Physics (6091) P2

Name:……………………………………….( ) Class:……………. BukitBatokSecondarySchoolGCE‘O’ LEVELPRELIMINARYEXAMINATIONS2021SECONDARYFOUREXPRESS PHYSICSPaper2Theory 6091/ 0227Aug20210800−0945h1hour 45minutesCandidatesanswerontheQuestionPaperNoAdditionalMaterialsarerequired.______________________________________________________________________________________ READTHESEINSTRUCTIONSFIRST Writeyourname,class,andclassregisternumberonalltheworkyouhandin.Writeindarkblueorblackink.YoumayuseanHBpencilforanydiagramsorgraphs.Donotusestaples,paperclips,glueorcorrectionfluid. SectionAAnswer allquestionsinthespaceprovided. SectionBAnswer allquestionsinthespaceprovided.Question12hasachoiceofpartstoanswer. Candidatesareremindedthat allquantitativeanswersshouldincludeappropriateunits.Theuseofanapprovedscientificcalculatorisexpected,whereappropriate.Candidatesareadvisedtoshowalltheirworkinginaclearandorderlymanner,asmoremarksareawardedforsounduseofPhysicsthanforcorrectanswers. Attheendofexamination,fastenallyourworksecurelytogether.Thenumberofmarksisgiveninbrackets[]attheendofeachquestionorpartquestion. FOREXAMINER’SUSESectionASectionBTOTAL

BBSS/2021/OPrelim/Sec4E/Physics(6091)/P2 ThisQuestionPaperconsistsof 21printedpages. Applyingpast knowledgetonewsituations 2

BBSS/2021/OPrelim/Sec4E/Physics(6091)/P2 SectionAAnswer allthequestionsinthissection.1 Amanstandsattheedgeofaverticalcliffandheprojectsastoneverticallyupwards.Thestonereacheditsgreatestheight,fellpastthemanandhitthebottomofthecliff. Themotionofthestoneisrepresentedbythevelocity-timegraphshowninFig.1.1. Fig. 1.1(a) ExplainhowFig.1.1showsthatairresistancehasnegligibleeffectonthemotionofthestone.……………………………………………………………………………………………... [1] (b) BasedonthedatashowninFig.1.1,determine(i) thegreatestheightachievedbythestone, greatestheight=…………………….Questioncontinuesonnext page… [2] Applyingpast knowledgetonewsituations 3

BBSS/2021/OPrelim/Sec4E/Physics(6091)/P2 (ii) theheightofthecliff. heightofcliff=……………………. [2] 2 Fig.2.1showsanapparatusthatdemonstrateshowacoinandapieceofpaperfallfromrestthroughair. Fig. 2.1 (a) Statetheinitialaccelerationofthepaperasitfallsfromrest. ……………………………………………………………………………………………... [1] (b) ThecoinandpaperareatthepositionsshowninFig.2.1.Byconsideringtheforcesactingoneachobject,explainwhy(i) thepaperfallswithconstantvelocity, ……………………………………………………………………………………… ……………………………………………………………………………………… [1] (ii) thecoinstillaccelerates. ……………………………………………………………………………………… ……………………………………………………………………………………… ……………………………………………………………………………………… [2] Applyingpast knowledgetonewsituations 4

BBSS/2021/OPrelim/Sec4E/Physics(6091)/P2 3 Fig.3.1showsasphereofweight6.5NsuspendedbyawirefrompointX.ThesphereispulledtoonesidebyahorizontalforceFsothatthewiremakesanangleof30°withthevertical. Fig. 3.1 Useascaleof1.0cmtorepresent0.50N,drawascalediagraminthespacebelowtodeterminethemagnitudeof(a) thetension(TW )inthewire,(b) thehorizontalforceF. magnitudeofTW =…………………….magnitudeofF=……………………. [3] Applyingpast knowledgetonewsituations 5

BBSS/2021