Prelim 2021 - Physics Pract P3

Class Indexno.Name: DEYI SECONDARY SCHOOL PreliminaryExamination2021SecondaryFour Express PHYSICS 6091/03Paper3Practical 12August2021 1hour50minutesCandidatesanswerontheQuestionPaper.AdditionalMaterials:AslistedinInstructionstoSupervisors._________________________________________________________________________ READTHESEINSTRUCTIONSFIRST Donot openthesebookletsuntil youaretoldtodoso.Writeyour nameandclass/register numberinthespacesabove.Writeindarkblueorblackink. YoumayuseanHBpencilforanydiagramsorgraphs.Donotusestaples,paperclips,glueorcorrectionfluid. Answer allquestions.AllofyouranswersshouldbewritteninthisQuestionPaper:scrappapershouldnotbeused.GraphpaperisprovidedinthisQuestionPaper. Additionalsheetsofgraphpapershouldbeusedonlyifitisnecessarytodoso. Youwillbeallowedtoworkwiththeapparatusforamaximumof55minutesforeachsection.For Examiner’sUse 1 2 3 Total Youareexpectedtorecordallyourobservationsassoonastheseobservationsaremade.Anaccountofthemethodofcarryingouttheexperimentsisnotrequired.Theuseofanapprovedscientificcalculatorisexpected,whereappropriate. At theendof theexamination, fastenall your worksecurelytogether.

2 Thenumberofmarksisgiveninbrackets[ ]attheendofeachquestionorpartquestion. SectionA 1 Inthisexperiment,youwillinvestigatetheextensionofaspring. Youhavebeenprovidedwith ● alengthofstringtiedtoaspring,● anS-hook,● astand,bossandclamp,● apieceofplasticpipe,● amassofweight1.5N,● asetsquare,● a30cmruler,● a50cmrule,● ametrerulefixedtothebenchwithBlu-tac,● aloopofstringonthemetrerule. (a)(i) Measureandrecordtheunstretchedlengthlo ofthespring,asshowninFig. 1.1. Fig. 1.1 lo =……………………..[1]

3 (a)(ii) Placeoneoftheloopsofthespringontotherodoftheclamp,asshowninFig. 1.2.Suspendthemassontheotherloop. Fig. 1.2 Measureandrecordthestretchedlengthls ofthespring.Determinetheextensioneo ofthespringusingtheequationeo =ls –lo . ls =……………………...[1] eo =……………………...[1] (b) Useyourvalueof eo from (a)(ii)andtheequationF=keo , whereF=1.5N,todetermine thespringconstantkforthespring. k=……………………...[1] [Turnover

4 (c) Removethespringfromtherodoftheclamp.Placetheplasticpipeintheclamp.Adjust theheightofthebosssothatthecentreoftheplasticpipeis50cmabovethebench.Adjustthepositonoftheclampstandsothatthecentreoftheplasticpipeisalignedwiththe50cmmarkonthemetrerule. AttachtheS-hooktotheloopofstringonthemetrerule.AttachthespringtotheS-hook.Placethestringovertheplasticpipeandsuspendthemassfromtheloopattheendofthestring,asshowninFig. 1.3. Fig. 1.3 (i) Adjustthepositionoftheloopofstringonthemetreruleuntilthespringisvertical. Measureandrecordthestretchedlengthl1 ofthespring.Determinetheextensione1 ofthespringusingtheequatione1 =l1 –lo . l1 =……………………...…… e1 =……………………...…[1]

5 (c)(ii) Withthemassstillsuspendedfromthestring,carefullymovetheloopofstringonthemetrerulesothatitisatthe15cmmark. Measureandrecordthestretchedlengthl2 ofthespring.Determinetheextensione2 ofthespringusingtheequatione2 =l2 –lo . l2 =……………………...……… e2 =……………………...……[1] (d) Useyourvalueofk,valuesofe1 ande