2021_FJS_4E_Phy_Prelim_P2

FAJARSECONDARYSCHOOL2021PRELIMINARYEXAMINATIONSSECONDARY4EXPRESS CANDIDATENAME CLASS INDEXNUMBERN/OLEVELINDEXNUMBER PHYSICSPaper2 NoAdditionalMaterialsRequired 6091/02 Date: 1September2021Duration:1hour45minutes READTHESEINSTRUCTIONSFIRST Writeyourname,classandindexnumberonalltheworkyouhandin.Writeindarkblueorblackpen.Youmayusepencilforanydiagrams,graphs,tablesorroughworking.Donotusestaples,paperclips,highlighters,glueorcorrectionfluid. SectionAAnswer allquestionsinthespacesprovided SectionBAnswerall threequestions,thelastquestionisintheformeither/or.Answer allquestionsinthespacesprovided. Attheendoftheexamination,fastenallyourworksecurelytogether.Thenumberofmarksisgiveninbrackets[]attheendofeachquestionorpartquestion.Incalculations,youshouldshowallstepsinyourworking,givingyouranswerateachstage.Theuseofanapprovedscientificcalculatorisexpected,whereappropriate. ForExaminer’sUse Paper1 40Paper2SectionA 50Paper2SectionB 30 Donot openthisdocument till permissionisgiven. Thisdocumentconsistsof 20printedpagesand0blankpages.

2 Total 120 SectionA[50marks] Answer allquestionsinthespacesprovided. ForExaminer’sUse 1 Fig.1.1showsahorizontalforceFpullingacarttowardstheright.Apendulumbobishangingfromaretortstandonthecart. Asthecartmoves,thependulumremainstiltedatanangleof20°tothevertical.Theweightofthebobis7.0N. Fig. 1.1 Drawascaleddiagramtodeterminethenetforceactingonthependulumbobwhenthecartismovinghorizontallytowardstheright.

3 netforce=………………………… [3] [Total:3]2 Amanpushesaboxofmass40kgalongastraighthorizontalpath. Fig.2.1showshowtheforceexertedbythemanvarieswiththedistancemovedbythebox. ForExaminer’sUse Fig. 2.1 (a) Theboxstartsfromrestandreachesavelocityof1.5m/safterittravelsadistanceof6.0m. (i) Calculatethegaininkineticenergyofthebox. kineticenergygained=………………………… [1] (ii) Calculatetheresistiveforceexperiencedbytheboxasittravelsadistanceof6.0m. resistiveforce=………………………… [3] (b) Themanpushestheboxforatotaldurationof10s.Calculatetheaveragepowerexertedbytheman. [TurnOver

4 averagepower=………………………… [2] [Total:6] 3 Fig.3.1showstheinteriorofaspraycan.Itisfirstfilledwithaliquidandtheninjectedwithgas.Thespraycaptrapsthehighlycompressedgaswithinthecan.Whenused,someoftheliquidleavesitandthepressuredecreases. ForExaminer’sUse Fig. 3.1 (a) Explain,usingmotionofmolecules,howthegasexertsapressureonthespraycan. ………………………………………………………………………………………………… ………………………………………………………………………………………………… ………………………………………………………………………………………………… [2] (b) Afterusingmuchoftheliquid,therateatwhichtheliquidissprayedoutdecreases. (i) Usingideasaboutmolecules,explainwhythishappens. ……………………………………………………………………………………..… …………………………………………………………………………………..…… ………………………………………………………………………………..……… ………………………………………………………………………………..……… [2] (ii) Explainwhythetemperatureinsidethespraycandecreases. ……………………….………………………………………………………………

5 …………………….………………………………………………………………… [1] [Total:5] 4 Fig.4.1showsawomanofmass60kgpushingherselfupfromtheground.Thegravitationalfieldstrengthis10N/kg. ForExaminer’sUse Fig. 4.1 (a)