4E Phy Prelim 2021 P3

BOONLAYSECONDARYSCHOOLPRELIMINARYEXAMINATION2021 Name ( ) Class Subject : PHYSICSPaperNo : 3SubjectCode : 6091/03Level : SECONDARYFOUREXPRESSDate/Day : 31AUGUST/ TUESDAYTime : 0815-1005Duration : 1HOUR50MINUTES READTHESEINSTRUCTIONSFIRST Writeyournameandindexnumberonalltheworkyouhandin.Writeindarkblueorblackpen.Youmayuseasoftpencilforanydiagrams,graphsorroughworking.Donotusestaples,paperclips,highlighters,glueorcorrectionfluid.Answer allquestions.ThePracticalExaminationisdividedintotwosections.Youareadvisedtospendnomorethan55minutespersection. Youwillstartwithonesectionandtherewillbeachangeover of equipment,55minutesafterthestartofthepaper. Youareexpectedtorecordallyourobservationsassoonastheyaremade.Anaccountofthemethodofcarryingouttheexperimentisnotrequired,unlessotherwisestated.Theuseofanapprovedscientificcalculatorisexpected,whereappropriate.Attheendoftheexamination,fastenallyourworksecurelytogether.Thenumberofmarksisgiveninbrackets[]attheendofeachquestionorpartquestion. For Examiner’sUse 1 2 3 Total Thisquestionpaperconsistsof12printedpages.

2 BLS/Prelim/2021/4E/Physics/6091/03

3 SectionA 1 Inthisexperiment,youwillinvestigatetheamplitudeofasimplependulum. Youareprovidedwith ● apendulumbobattachedtoalengthofstring,● asplitcork,● astand,bossandclamp,● astopwatch,● ametrerule,● acounterweighttopreventthestandfromtoppling,● apieceofcardmarkedwithaseriesofparallellines,drawnat2cmintervals. Theapparatushasbeensetupforyou,asshowninFig.1.1(a)andFig.1.1(b) Fig. 1.1(a)(frontview) Fig. 1.1(b)(sideview) (a) (i) Thedistancefromthebottomof thesplit corktothecentreof thependulumbobisH.LoosentheclampandadjustthestringuntilHisequalto1.25m.Tightentheclamp. (ii) Adjustthebosssothatthedistancehfromthebottomofthependulumbobtotheflooris2.0cm. BLS/Prelim/2021/4E/Physics/6091/03

4 1 (b) Viewthependulumfromthefront,asshowninFig.1.1(a).Movethependulumbobafewcentimetrestotheside.Releasethependulumbobsothatitswingsfreely. DetermineanaccuratevaluefortheperiodTofthependulum. T=………………………………[2] (c) (i) Stopthependulum.Placethepieceofcardonthefloorbeneaththependulumbob.Thelinesonthecardaredrawnat2cmintervals. Adjustthepositionofthecarduntiltherighthandedgeofthependulumbobisalignedwiththe0cmmarkonthecard,whenviewedfromabove,asshowninFig.1.2. Fig. 1.2(viewfromabove) (ii) Movethependulumbobtothesideuntil theright handedgeof thebobisalignedwiththe12cmmarkonthecard,asshownbythedottedlineinFig.1.2. Releasethependulumbob.Measureandrecordthetimetfortheamplitudeofthependulumtodecreasefrom12cmto10cm. t=…………………………………[1] (iii) Suggestwhytheamplitudeofthependulumdecreases. …………………………………………………………………………………………….. BLS/Prelim/2021/4E/Physics/6091/03

5 ……………………………………………………………………………………….....[1] 1 (d) Plan Astudentsuggeststhatthetimetakenfortheamplitudetodecrease,asin(c)(ii),isdirectlyproportionaltothemassofthependulumbob. Plananexperimenttoinvestigatethisrelationship. Yourplanshouldinclude ● thequantitiesthatyouwillkeepconstant, ● adetaileddescriptionofhowyouwillperformtheinvestigation, ●