Spm 4531 2005 Physics p3 Bjwp

8/2/2019 Spm 4531 2005 Physics p3 Bjwp

1/15

lzslilla SectionA. .

[28 marks]Answer all questions.

The time suggested o answer this section is 60 minutes.A studentcarries out an experiment o study the relationshipbetween he speed,v, ofa trolley with the distance of compression,e, of a spring that pushes he trolley downa track.A piece of ticker tape is fixed to the trolley which is placed on a frictioncompensated rack. The trolley is pushedback to compressthe spring to a distanceof compression, , eqtalto 2.0 cm, as shown in Figure 1.1. The trolley is thenreleasedand it moves down the track with speedu.

End of the track

FIGURB .1A section of the ticker tape which represents he movement of the trolley when itreached the end of the track, is taken. The actual size of the ticker tape is shown inFigure I.2 on page6.The aboveprocedure s repeatedby varying the values of e, to be 3.0 cm, 4.0 cm,5'0 cm and 6'0 cm. The actual sizes of the sectionsof the ticker tapes are shownin Figures 1.3, I.4, 1.5 and 1.6 on pages6 and 7 respectively.The speed,u, when the trolley reachedthe end of the track can be calculated usingthe formula below;

X_ lv=-cms ^0'2where x is length for 10 ticks as shown in Figure 1.7. One tick is the time takenfor the trolley to move between two consecutive dots.

It t l t2t3t4 t5 t6t7 tg tg t lot '

Ticker apeDistanceof compression,

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SPM 2005 PHYSICS P3


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1(aXr)E1(a[ii)

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1(c)

r(d)

(a) For the experimentdescribed n page5, identify;(i) the manipulated ariable,

lI markl(ii) the respondingariable,

$ markl(O a fixed variable.

ll markl(b) using the methodshown n Figurer.7 on page5, determine , for every ickertapeon Figures1.2, 1.3, .4, 1.5and 1.6.

(i) Detach he scaleon page6 and use t to measure for everyticker tapeonFigures .2, L.3,1.4,1.5and1.6.Write the valuesof x on the spaces rovidedon pages6 and7.

(ii) Calculatehevaluesof v for every ickertapeusing he formula v=+0.2Tabulateyour results or x andv for everyvalueof e in the spacebelow.[7 marksl

On the graphpaperon page11,draw a graphof v againste. 15markslUse your graph n (c), to state he relationshipbetweenv ande.

} markl

(c)@


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6/15

A student carried out an experiment to investigate the relationship between theresistance,R, and diameter, d, for a constantan wire, and determine theresistivity, , of constantan.The student used five constantan wires with differentlength, l, of eachwire as 2x103mm.The results of the experiment are shown in the graph R

nyoGraphof R against 1ad"

diameters and fixed the

Iasainst - in Fisure2.1.d'

0.8

0.7

0.6

0.5

r_ !

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0.3 0.4FIGURE2.1

0.6 0.71-)- lmm'

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(a) State the relationship between R and dz

lI markl(b) A constantanwire of unknown diameter hasa length of 2xI03 mmand a resistanceof 0.5Q.

IUsing the graphof R against rt on page13,determine he diameterof the wire.Show on the graph how you determinedthe diameter.

13marksl(c) The resistivity, p , of constantan s given by the formula:

/^ tr \p = o'7861!i-' t I )I f m = Rd.2, then = 0.7g6(Y),' \ t )wherem is thegradientof the graphof R ugurn j .(i) Calculate he gradient,m,of the graphof R against #Show on the graphhow you determined n.

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ExaminerUse?9L

2(b)E

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( i i ) Using the formula pt=0.786t) , calculate the resist iv i ty, p,' \ I )of constantan.Use/- 2x103mm.

P - 12marksl@ Anotherconstantan ire has a diameterof 2.5 mm and a lengthof 500mm.,_.r)

Using he ormulap = 0.736[ 4- I and hevalueof p in (c)(ii), calculatehe\ r )resistanceof the wire.

R = """"' lz marksl(e) Stateoneprecautionhat shouldbe takenduring his experiment.

ll mark)

2@E

2(e)Total


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Section B[12 marksl

Answer any one question.The time suggested o answer this section s 30 minutes.

Before going on a long journey, Shareenameasured he air pressure n the tyre of hercar' as shown n Figure 3.1. Shefound that the air pressure n the tyre was 190kpa.A.fterthe ourney, Shareenameasuredagun the air pressure n the tyre as shown nFigure 3.2. She found that the air presiure in the tyre had increasld b 235kpa.Shareena lso found that the tyre becamehot after the ourney. However the sizeof thetyre remained he same.

Insfrumentformeasunngarrpressure

FIGURE.IUsing the informationon Shareena's bservationon(a) Make one suitable nference.(b) Stateone appropriatehypothesis hat could be

FIGURE3.2the air pressure

investigated.

in the tyre;l1 markl[1 mark]


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(c) Designan experimento investigate he hypothesis tated n (b).Choose uitableapparatus uchas a prcssuregauge,a roundbottomflask anothers.In your description,stateclearly the following;(i) aim of the experiment,(ii) variablesn the experiment,

(iii) list of apparatus ndmaterials,(iv) arrangement f the apparatus,(v) &e pnocedurefdre experiment,which ncludeshe methodof controlling hmanipulated ariableand he methodof measuringhe respondingvariible,

(vi) the way you would tabulate he data,(vii) the way you would analyse he data.

ll0 marksl


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Figure4.1 showsa cross-sectionf a bicycledynamowhichhasamagnctanda coiloflnsulatedcopperwire. The outputof the dynamos connectedo a bicycle amp.The lamp will light up whenthe magnet s rotatedby turningthe wheel.The lightgetsbrighterwhenthe wheelturns faster.

Bicycle dynamoBicycle wheel

MagnetI^arrp

FIGURE4.1Usingyourknowledgeof elecffomagnetism;(a) Make one suitable nference. tl markl(b) Stateone appropriate ypothesishat could be investigated. U markl(c) Designan experimento investigate he hypothesis tatedn (D).

Choosesuitableapparatus uchas a bar magnet,a coil of copperwireand others.In your description,stateclearly the following;(i) aim of the experiment,(ii) variablesn the experiment,(iii) list of apparatus ndmaterials,(iv) arrangement f the apParatus,(v) thepnoceduref theexperiment,which ncludeshemethodof controlling hemanipulated ariableand he methodof measuring heresponding ariable,

(vi) the way you would tabulate he data,(vi| the way you would analyse he data. lLOmarksj


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RUANG JAWAPAN/SPACE FOR ANSWERSNo. Soalan/Questiono:

KegunaanPemeriksa/ForExatniner'sUse

sebelah


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Paper 3Seetion A1 (a) ( i)r i r )t i i r )

(b)

l .t.ngtlr o{ spring compression"Vr:lot:it,.yMirss tt1'che trol ley/spring constant/{rulicnt of the sloPe.

Graph i u".r,ru;!

R is inversely ProPortional to d2'b = o'41mm-zd2 = of, **-,d2 = 2.43 rrrm2d = 1.56 mm

R

(a)(b)

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[- L";I uttlcCImpleIr--Ir --IL__ _lt__(c ) Graph u versus e

(d) Velocity varies directly with the length of springeompression"

( i i ) l=2xl-03mmp =o.?86(###Hxro')(c) (il Gradient, nz

= 4.87(d) d =2.5mm,14.87 A mm :

0.61 0.3= g;: gr25= 12.4Cl mm2

Omm= 500 mm0.7S6 R x (2.5 mm)'z)500 mm4.87 Q mm x 500 mm- 0.786 (2.5mm)'= 495.67Q(e) Securely fasten the connecting wire'

Section B3 (a) Inferenee:When the temperature of gas enclosed in acontainer increases, the pressure of the gasincreases and vice-versa'(b) HsrPothesis:Wh"tt the temperature of gas enclosed in acontainer increases, the pressure of the gasincreases.

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rlelocityu/cm s-r

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6.0 15.5 77.5

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14/15

Wiremesh

Airn of cxperiment:' l 'o st t r t i -y he relat ionship between t 'hepr()ssue cxertedby a gasand its temperature;rt,ctnstant voiurne.Variables in the exPeriment.Manipulated:'lemperature.Responding:Pressure.Constant:Volume of the gas.List of apparatus and the materials:Pressure gauge, round bottom flask,thermometer, glass tube, rubber tube, heatinsulator, retort stand, tripod, wire mesh,rubber stopper, beaker, stirrer and Bunsenburner.Arrangement of aPParatus:

Retort stand IceThermometer Rubber tube

ClampStirrer Bourdongaugeeaker

BunsenburnerProeedure:The apparatus as shown is prepared' Someice s inserted into the water solution to lowerthe temperature of water. Water is stirred tomaintain a uniform temperature. When thethermometer reading indicates 40 'C,thepressure reading from the Bourdon gauge isrecorded.The steps epeatedat 45 "C,50 "C,55 "C, 60 "C and 65 "C. From the resultsobtained, a graph of pressure (P) againsttemperature (t) in degrees Celsius and thegraph of pressure (P) against (?) in Kelvinare plotted.

-273"C..Figure (i)

P/N m-'z

*TIKFigure (ii)

Discussions:The graph of Pressure, P againsttemperature, / in "C is as shown in th*Figure (i). If the origin of the graph is shiftedto -273 "C(0 K) as shown in Figure (ii), thegraph of graph of pressure, P against, T inKelvin is a straight line that passes hroughthe origin. The straight-line graph thatpasses hrough the origin indicates that thepressure is directly proportional to th eabsolute temperature ?.Conclusion:The pressure exerted by a gas, P having aconstant mass is directly proportional to itsabsolute temperature, f provided that itsvolume is maintained constant.Inference:When a magnet moves n acoil of wire rapidly,the magnitude of the induced curuentincreases or the bulb becomesbrighter-Hypothesis:The more rapidly a magnet moves through acoil, the greater is magnitude of the inducedcurrent produced.Aim of experiment:To study the relationship between the motionof a magnet in a coil and the induced currentproduced.Variables of the exPeriment:Manipulated:Height of the magnet (height of magnet fromthe coil determines the velocity of the magne[in the coil).Responding:Galvanometer reading.Constant:No of turns in the coil.

4 (a)

(b)

(c.)

P/N m-2

Temperature,TI"CTemperature,TII( Pressure'P/]\[ m-2

404550556065


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Arrangement of :tpparattts:

{ alvzrnometer

List of apparatus and materials.Bar magnet, coil of'wire, galvanometerandconnecting wire.Procedure:Apparatus as shown in the figure above isprepared. The height of the bar magnet fromthe tatrle is set as 20.0 cm. The magnet is thendropped into the coil of wire. The deflectionof the galvanometer is recorded in a table.The experiment is repeated with heights of30.0cm,40.0 cm,50.0cm and 60.0cm.Fromthe results obtained, a graph of thegalvanometer, 1 against height of the barmagnet from the surface of the table, r isplotted.Discussion:Graph of galvanometer reading, 1 againstheight of the bar magnet from the surface ofthe table, r is a straight-line graph throughLheorigin. The straight- line graph through[he origin shows that magnitude of theinduced current, 1 varies directly with thevelocity of the magnet, represented by theh*ight of the bar magnet from the surface oft.he able, r.ea*clucion:'l'he magnitude of the induced current will

Coil of wirtr

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Spm 4531 2005 Physics p3 Bjwp