sampletask phy e 20111019

8/13/2019 SampleTask PHY E 20111019

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TABLE OF CONTENT

Task Title

E1 Relationship between pressure and volume of a gas

E2 Newtons second law of motion

E3 Centripetal force

E4 Focal length of a convex lens

E5 Internal resistance of a battery

IS1 Rate of Cooling

IS2 Friction

IS3 Terminal Velocity

IS4 Projectile

IS5 Electromagnet


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PhysicsandCS(Physics) SampleSBATask

PracticalSkills( %)

Reporting ( %)

Total

Name:E1 Relationship betweenClass: No.:Pressure and VolumeDate:of Gas

Objectives: Toinvestigatetherelationshipbetweenpressureandvolumeofairinasyringe.

Apparatus: 60cm3plasticsyringeBourdongauge

rubbertubing

vaseline

Theory:

Boyle's lawstates that pressureis inverselyproportional tothevolumeofa gas,providedthatthe

massandtemperatureofthegasremainconstant.Thisrelationshipcanbedemonstratedbyasyringe

ofair.ThesyringeisconnectedtoaBourdongaugetomeasurethepressure.Thevolumeofthegas

canbeestimatedbyreadingthescaleonthesyringe.

Procedures:

1. Takeoutthepistonofthesyringe. Putalittlevaselineevenlyontopofpiston.Fitthepiston

backtothesyringe.

2. Setthevolumeofairinsidethesyringetoroughly25cm3.

3. Connect the syringe to theBourdon gauge with rubber tubing. Put alittle vaselineon the

surfaceofconnectorsbeforefittingintherubbertubing.

4. TheBourdon gauge should read roughly1.0 105 Pa (approximately equal to atmosphericpressure). As the pointer of the Bourdon gauge may get stuck due to the friction of the

mechanicalpartsinside,taptheBourdongaugeslightlyeverytimebeforeyoutakeareading.

Bourdon

gauge

syringerubber

tubing

piston

StudentHandoutE1(P) page1of5


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5. AdjustthepistonuntiltheBourdongaugereadingis1.0105 Pa.Recordthevolumeofthegasinsidethesyringe.

6. Pulloutthepistonslowlyuntilthepressureisreducedto0.9105 Pa.Keepthispressureandholdthepistonfor15seconds.Takethereadingofthevolumeofthegasinsidethesyringe.

7. Repeatstep6byfurtherpullingoutthepistonandreducingthepressureby0.1105 Paeachtime. Remembertokeepthepressureandholdthepistonby15secondsbeforethevolumeis

read.

8. Whenthepressureisreducedto0.7105 Pa,repeattheexperimentbyreturningthepistonto1.0105Painstepsof0.1105Pa.

9. Thevolumeafterthepressureisreturned to1.0 105 Pashouldberoughlythesameastheinitialvolume.Ifthereisalargedifference,checktheapparatusandrepeattheexperiment.

10. Repeattheexperimentby pushing in the piston and increasingthepressureto 1.1 105 Pa,5 5 51.2 10 Pa, 1.3 10 Pa and 1.4 10 Pa. Then repeat the experiment by returningto

1.0105Pa. Remembertoholdthepistonfor15secondsbeforetakingeachreading.

Results:

Pullingoutthepiston:

Pressure(p)/105Pa 1.0 0.9 0.8 0.7 0.8 0.9 1.0

Volume(V)/cm3

Pressinginthepiston:

Pressure(p)/105Pa 1.0 1.1 1.2 1.3 1.4 1.3 1.2 1.1 1.0

Volume(V)/cm3

For aparticular pressure, take themeanofvolumeswhenthepressureis increasedanddecreased.

Completethetablebelow.

Pressure(p)/105Pa 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4

MeanVolume(V)/cm3

1/p/10-5Pa-1



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Plotagraphofvolume(V)ofthegasagainst1/pressure(1/p)atroomtemperature.



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Further Investigation:

Fromthegraph,findthevolumeofairinsidetherubbertubingandtheBourdongauge.Derivethe

formulayouused.



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PracticalSkills( %)

Reporting ( %)

Total

Name:

E2 Newtons second law of motion Class: No.:

Date:

Objective: Toinvestigatetherelationofthemass,accelerationandnetforceactingonanobject.

Apparatus: data-loggerinterfacewithamotionsensor

elasticthreads(unstretchedlengthabout20cm)4

friction-compensatedrunway

trolley

0.5kgweights/additionaltrolleys3

electronicbalance(optionalifthemassofthetrolleyisknown)

Part ANet force and acceleration

Procedures:1. Prepareaset-uptorecordthemotionofatrolleyonarunwayasshownbelow.Whilenecessary,adjust

therunwayforfrictioncompensation.

2. Start data-logging. Use 1 elastic thread to pull the trolley along the track. The thread should be

stretchedbythesameamountthroughout.

3. Fromtheslopeofthevelocity-timegraphgeneratedbythedata-loggingprogram,findtheacceleration

ofthetrolley.

4. Takeonemoreconfirmatorytrialandobtainthemeanvalueoftheaccelerationofthetrolley.

5. Repeatsteps24with2,3and4elasticthreadsrespectively.Thethreadsshouldbestretchedbythe

sameamountasbefore.

6. Plotagraphoftheaccelerationa ofthetrolleyagainstthenumberofelasticthreadsN used.



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Results:

Massofthetrolleym =__________kg

NumberofthreadsN

1

2

3

4

Agraphofa againstN:

Accelerationa/ms2

1st

trial 2nd

trial Mean



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PhysicsandCS(Physics)

SampleSBATask

Discussion:

1. Withtheaid ofa freebodydiagram, explain the meaningoffrictioncompensationin step1oftheprocedures above. Describe briefly the experimental steps to show that the runway is friction

compensated.

2. Statethecontrolvariable(s),dependentvariable(s)andindependentvariable(s)inthisexperiment.

3. WhatphysicalquantitydoesthenumberofthreadsNrepresent?Fromthegraphplottedabove,whatcanyousayabouttherelationofthemass,accelerationandnetforceactingonanobject?

4. Whileyou pull the trolley, the thread should bestretched by the same amount throughout. Explainbrieflywhyitisimportantinthisexperiment.



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Part BMass and acceleration

Procedures:

1. Preparethesameset-upasPartAtorecordthemotionofatrolleyonarunway. Whilenecessary,

adjusttherunwayforfrictioncompensation.

2. Start data-logging.Use2 elastic threads to pullthetrolleyalong the track. The thread should bestretchedbythesameamountthroughout.

3. Fromtheslopeofthevelocity-timegraphgeneratedbythedata-loggingprogram,findtheacceleration

ofthetrolley.

4. Takeonemoreconfirmatorytrialandobtainthemeanvalueoftheaccelerationofthetrolley.

5. Repeatsteps24withadditionalweightsplacedonthe trolley. Thethreadsshouldbestretchedby

thesameamountasbefore.

16. Plotagraphoftheaccelerationa ofthetrolleyagainst wherem isthetotalmassofthetrolley.

m

Results:

NumberofthreadsN =__________

Totalmassofthetrolleym/kg (m

1)/kg

1

Accelerationa/ms2

1st

trial 2nd

trial Mean



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1 Agraphofa against :

m

Discussion:

1. Statethecontrolvariable(s),dependentvariable(s)andindependentvariable(s)inthisexperiment.

2. Fromthegraphplottedabove,whatcanyousayabouttherelationofthemass,accelerationandnet

forceactingonan object ?Hence, togetherwith theresults fromPartA,suggest ageneral relation

amongthem.



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PhysicsandCS(Physics)SampleSBATask

3. DiscussTWO majorsourcesoferrorsinthisexperimentandway(s)forimprovement.

4. Now,iftherunwaywereinclinedatananglegreaterthanthatrequiredforfrictioncompensation,how

wouldthegraphsobtainedinPartAandPartBbeaffected?Assumethatthefrictionisunchanged

throughout.



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PracticalSkills( %)

Reporting ( %)

Total

Name:

E3 Centripetal force Class: No.:

Date:

Objective: Tomeasurethecentripetalforceofwhirlingamassroundahorizontalcircleandcompareitwiththetheoreticalvalue.

Apparatus: rubberbung

glasstubeabout15cmlong

slottedweights,withhanger120.02kg

nylonthread1.5m

papermarker

adhesivetape

metrerule

stopwatch

Procedures:

1. Attachoneendofa1.5mlengthofnylonthreadtoarubberbungandthreadtheotherendthrougha

glasstube,apapermarkerandanumberofweightsasshown.

Mslotted

weights

M

paper

marker

paper

marker

rubber

bung

glasstube

1.5mlengthof

nylonthread

glasstube

mL

rubber

bung

2. Firstadjustthepositionofthepapermarkersothatitisatoneendoftheglasstube,andthelengthof

thethreadL fromtheotherendoftheglasstubetotherubberbungis,say,0.8m.Fixthepositionof

thepapermarkerusingadhesivetapeifnecessary.FirststartwithM =0.12kg(i.e.120g).

3. Holdingtheglasstubevertically,whirlthebungaroundaboveyourheadinahorizontalcircle. (Note

thatthenylonthreadneednotbehorizontal.) Increasethespeedofthebunggraduallyandallowitto

moveout(i.e.letL increases)untilthepapermarkerisjustbelowtheglasstubewithouttouchingit.



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4. Trytokeeptheangularspeedconstantsothatthepapermarkerisjustbelowthetubethroughout.Ask

yourpartnertotime20revolutionsofthebungusingastopwatch.Remembertostartthestopwatch

at0andstopitat20.Takeonemoreconfirmatoryreadingandobtainthemeantimefor20revolutions.

CalculatethetensionT inthestringandtheangularvelocity.

5. RepeattheproceduresusingdifferentmassesM

.RemembertocheckconfirmatoryreadingforeachvalueofM.

6. Measurethemassm oftherubberbung.

7. PlotasuitablegraphtofindtherelationbetweenandT.Results:

Massoftherubberbungm =__________kg

LengthofthethreadL =__________m

AngularspeedTimefor20revolutions20t/ s

M/kg T = Mg / N 2= /rads

-1

1st ttrial 2

ndtrial Mean



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4. DiscussTWO majorsourcesoferrorsinthisexperiment.


1. DesignanexperimenttofindtherelationbetweenandL.



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PracticalSkills( %)

Reporting ( %)

Total

Name:

E4 Focal length of a convex lens Class: No.:

Date:

Objective: Tomeasurethefocallengthofasphericalconvexlens.

Apparatus: sphericalconvexlenswithholder

lamphousing

whitescreen(opague/translucent)

metrerule

Part AForming image of a distant object

Procedures:

1. Placeaconvexlenswithaholdernearawindow. Movetheopaque/translucentscreentoaposition

whereasharpimageofadistantobjectisformedasshownbelow.

parallelrayscoming

fromafaraway

building

screen

theinverted

imageofthe

buildingconvexlens

f

2. Measurethedistancebetweenthelensandthescreen. Thisisthefocallengthofthelens.

Results:

ThefocallengthfoundinPartA, f1=__________cm

Discussion:

1. Statethenatureoftheimageformed.

2. Ifthescreenisremoved,canyouseetheimageofthedistantobject?



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Part BPlane mirror method

Procedures:

1. Putanopaquescreensidebysidewithalamphousing(withaletterF). Attachaplanemirrortoa

convexlenswithholderandplacetheminfrontofthelamphousingandthescreenasshownbelow.

lamphousing opaquescreen

convexlens

planemirror

metrerule

2. Movethelens-mirrorcombinationuntilasharpimageisformedontheopaquescreen.

3. Measuretheobject/imagedistance,i.e.thedistancebetweenthelensandthescreen. Thisisthefocal

lengthofthelens.

Results

ThefocallengthfoundinPartB, f2=__________cm

Discussion

1. Statethenatureoftheimageformed.

2. Willtheresultbedifferentifthedistancebetweentheplanemirrorandthelensischanged?



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Part CUsing lens formula

Procedures

1. Preparetheset-upshownbelow.Setthedistancebetweenanilluminatedobjectandthelens,i.e.the

objectdistanceu,toavaluecloseto2f1(or2f2).

translucentscreen

object

distanceu

image

distance v

lamphousing convexlensin

holder

2. Adjustthepositionofthetranslucentscreenuntilasharpimageisformedonitandmeasurethe

distancebetweenthelensandthescreen,i.e.theimagedistancev.

3. Changetheobjectdistanceu tosomevalueslargerthan2f1andrepeatthemeasurementtoobtain3

morepairsofu andv.

4. Changetheobjectdistanceu tosomevaluessmallerthan2f1andrepeatthemeasurementtoobtain3

morepairsofu andv.

1 1 5. Plotagraphof against .Thefocallengthcanbeobtainedfromthey-interceptofthegraph.

v u

Results:

u/cm v/cmu

1/cm

1

v

1/cm

1

u 2f1



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ThefocallengthfoundinPartC, f3=__________cm

Discussion:

1. Statethenatureoftheimagesformedinsteps2,3and4.

2. Thefocallengthofaconcavelenscannotbefoundbythismethod.Why?



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3. Byusingthelensformulaf

1

vu

11+= , showhow the focallengthofthe lens isobtained from the

y- interceptofthev

1against

u

1graph.

4. Ifhalfofthelensiscoveredbyacardboard,describeanychangesoftheimageformed.


1. Repeattheexperimentwithotherlensesofdifferentthickness.Findouthowthethicknessofalens

affectsitsfocallength.

2. InPartC,whatistheminimumdistancebetweentheobjectandtheimage?



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PracticalSkills( %)

Reporting ( %)

Total

Name:E5 Internal ResistanceClass: No.:of a BatteryDate:

Objective: Todeterminetheinternalresistanceofabattery.

Apparatus: battery(31.5VAAdrycells)voltmeter(5V)

ammeter(1A)

rheostatR

fixedresistorR'

connectingwires

switch

Theory:

Arealbatteryalwayshasinternalresistance. Simpletheoryregardsarealbatteryasanidealbattery

ofe.m.f.inserieswiththeinternalresistancer.

V

I

r

WhenacurrentI passesthebattery,thepotentialdifferenceV acrossthebatteryisgivenby

V =IrIfV isplottedagainstI,theinternalresistanceande.m.f.ofthebatterycanbefound.

Procedures:

1. Connectthecircuitasshowninthediagrambelow.

V

A

R

R'



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2. Keeptheswitchturnedoff. Takethereadingofthevoltmeter. Thisistheinitialelectromotive

force(e.m.f.)ofthebattery.

3. Settherheostattozero.Turnontheswitchandtaketheammeterandvoltmeterreadings. Turn

offtheswitchoncethereadingsaretaken.

4. Increase the resistance of the rheostat. Turn on the switch and adjust the rheostat until the

current is roughly 0.1 Abelow the value in (3). Take the ammeter and voltmeter readings.

Remembertoturnofftheswitchoncethereadingsaretaken.

5. Repeatstep4bydecreasingthecurrentinstepsof0.1A. PlotagraphofthevoltageV against

thecurrentI.

Results:

Initialelectromotiveforceofthebattery=___________________V

AmmeterreadingI/A

VoltmeterreadingV/V

PlotagraphofV againstI.



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___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________


Fromthegraphabove,howcanyoufindtheinternalresistanceande.m.f.ofthebattery?Derivethe

formulaeyouused.

Conclusion:

Theinternalresistanceofthebatteryis_____________________.

Thee.m.f.is_____________________V.

Discussion:

1. Whyisitnecessarytoturnofftheswitchaftereachreadingistaken?

2. Doyouthinkthattheresistanceoftheconnectingwireisasignificanterrorinthisexperiment?

Explainbriefly.



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________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________


3. Thebatterycontainsthreeidenticaldrycellsinseries.Whatarethee.m.f.andinternalresistanceof

eachdrycell?Explainbriefly.


Settheresistanceoftherheostattozero. Turnontheswitchforroughly10minutes. Repeatsteps

3to5andplotanotherV -I graph. Whathappentotheinternalresistanceande.m.f.afterthebattery

has been discharged for 5 minutes ? Suggest what happens inside the dry cells while they are

discharging?



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Factorsaffectingtherateofcoolingofhotwater StudentManualInvestigative Study To study the factors affecting the rate of cooling of hot water

Task outline:

Inthisinvestigation,youaregoingtofindthefactorsaffectingtherateoftemperaturedropofhotwater

anddesignexperiments toshow theirrelationships.Youshouldcollaboratewithyourgroup-mates tocompletethetask.YoushouldapplyyourknowledgeandskillsinPhysicstosolvetheproblemsand

drawconclusionsbasedontheresultsobtained.

Theinvestigationisdividedintofivestages.

1. Searchingforanddefiningquestionsforinvestigation

2. Developinganinvestigationplan

3. Conductingtheinvestigation

4. Organisingandanalysingdataforajustifiedconclusion

5. Presentingtheinvestigationfindingswithawrittenreport,postersandothermeans

Apparatus:

Thefollowingapparatusandmaterialswillbeprovided:

Datalogger Temperaturesensor Vacuumflask Stirrer Thermometer Corkplate Electrickettle Studentsarerecommendedtoproposeotherapparatusandmaterialsthatmaybeuseful.

Discussion:

1. Propose the factors affecting the rate ofcoolingofhot water. Identifythe independent variables,

dependentvariablesandcontrolvariablesinyourexperiment.

2. Carryoutabookandwebsearchaboutthelawofcooling.

3. Writedownanequationrelatingthepowerlossandtherateoftemperaturedropofthehotwater.

4. Designaseriesofexperimentstoverifytheequationproposedin(3).

5. Carryoutariskassessmenttoidentifythesafetyprecaution(s)neededtobetaken.

Assessment:

Yourworkwillbeaccessedinthefollowingareas.

P.1/2


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Factorsaffectingtherateofcoolingofhotwater StudentManualDesign of the experiment (marks to be given in the report)

Designanexperimenttofindouthowthefactor(s)affecttherateoftemperaturedropofhotwater.

Thispartshouldbesubmittedbeforetheexperiment. Commentswillbegivenandyourrevisedplan

shouldbeincludedinthereport.

Implementation

1. Implementationofactionplanwithunderstanding

2. Properuseofapparatus

3. Properexperimentalskills

4. Groupworkandtimemanagement

5. Abilitytodealwithproblemsencounteredindependently.

Questionsmaybeaskedduringtheexperimenttoverifyunderstanding.

Report

1. TheoryDraftshouldbesubmittedbeforetheexperiment.Eachgroup

2. ExperimentDesignandProcedureisrequiredtosubmitonesetonly

3. Apparatus

4. DatapresentationandgraphplottingIndividual work. Tobe

5. Analysisandconclusiondrawnaccordingtoexperimentalresultsattachedtotheendofgroupwork.

6. Recordofreferencematerials

Recordformatforreferencematerialsifany

Book/Website:__________________________________________________________

Author:______________ Publisher/Organisation:_________________Year:_____

Reading/BrowsingDate:_________ Timespentonstudyingtheinformation:______

Relevantinformation:

Work Schedule:

6Nov2010 SubmissionofExperimentDesign

13Nov2010 Trial/Preliminaryexperiment

20Nov2010 Experiment

27Nov2010 SubmissionofReport

P.2/2


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Factorsaffectingfriction StudentManualInvestigative Study - To study the factors affecting friction

Task outline:

Inthisinvestigation,youaregoingtofindthefactorsaffectingfrictionanddesignexperimentstoshowtheir

relationships. Youshouldcollaboratewithyourgroup-matestocompletethetask. YoushouldapplyyourknowledgeandskillsinPhysicstosolvetheproblemsanddrawconclusionsbasedontheresultsobtained.







Apparatus:


Woodenblock Drawingboard Springbalance Weightsandnuts Electronicbalance Spiritlevel Finebrush Studentsarerecommendedtoproposeotherapparatusandmaterialsthatmaybeuseful.

Discussion:

1. Proposethefactorsthatcanaffectfriction. Arethesefactorschangeableintheexperiment?Identify

theindependentvariables,dependentvariablesandcontrolvariablesinyourexperiment.

2. Carryoutabookandwebsearch.Collectmoreinformationaboutfriction.

3. Designaseriesofexperimentsinwhichyoucancheckyourhypotheses.

4. Carefullyexaminethefeasibilityandvalidityofyourexperiments.


Assessment:

Yourworkwillbeaccessedinthefollowingareas.

P.1/2


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Factorsaffectingterminalvelocity StudentManualInvestigative Study - To study the factors affecting terminal velocity

Task outline:

Inthisinvestigation,youarerequiredtofind the factors affecting the terminal velocity of a falling sphere in

water anddesignexperimentstoshow their relationships. Youshouldcollaboratewithyourgroup-matestocompletethetask. YoushouldapplyyourknowledgeandskillsinPhysicstosolvetheproblemsanddraw

conclusionsbasedontheresultsobtained.







Apparatus:


Aplastichollowtubeof5cmdiameterand2mlong Hollowsphere(s)of1.5cmdiameter Smallmetalspheres Stopwatch Metrerule Studentsarerecommendedtoproposeotherapparatusandmaterialsthatmaybeuseful.

Discussion:

1. Proposethefactorsthatcanaffectterminalvelocity. Arethesefactorschangeableintheexperiment?

Identifytheindependentvariables,dependentvariablesandcontrolvariablesinyourexperiment.

2. Carryoutabookandwebsearch.Collectmoreinformationaboutterminalvelocity.




Assessment:

Yourworkwillbeassessedinthefollowingareas.

P.1/2


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Factorsaffectingterminalvelocity StudentManualDesign of the experiment (marks to be given in the report)

1. Hypothesisandexperimentdesign

2. Dependent,independentandcontrolvariables

Thispartshouldbesubmittedbeforetheexperiment. Commentswillbegivenandyourrevisedplanshould

beincludedinthereport.

Implementation







Report

1. TheoryDraftshouldbesubmittedbeforetheexperiment. Each2. ExperimentDesignandProceduregroup isrequiredtosubmitonesetonly3. Apparatus

4. Datapresentationandgraphplotting Individual work. Tobe

5. Analysisandconclusiondrawnaccordingtoexperimentalresults attachedtotheendofgroupwork.



Book/Website:__________________________________________________________




Work Schedule:

13Sep2010 SubmissionofExperimentDesign

21Sep2010 Trial/Preliminaryexperiment

28Sep2010 Experiment

4Oct2010 SubmissionofReport

P.2/2


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Factorsaffectingrangeofprojectile StudentManualInvestigative Study - To study the factors affecting the range of a projectile

Task outline:

Priorknowledgeofprojectilemotionisrequired.

Inthisinvestigation, you aregoingtomakeanairtableorotherapparatus suitablefor studyingprojectilemotion anddesign experimentsto showthat the rangeofprojectionofanobject isproportional tov2 andsin(2)oftheprojection. Youshouldcollaboratewithyourgroup-matestocompletethetask. Youshould

applyyourknowledgeandskillsinPhysicstosolvetheproblemsanddrawconclusionsbasedontheresults

obtained.







Apparatus:


AirblowerDiscmovingontheairtableDigitalvideocameraMetrerule Studentsarerecommendedtoproposeotherapparatusandmaterialsthatmaybeuseful.

Discussion:

1. Proposethefactorsthatcanaffecttherangeofaprojectile. Arethesefactorschangeableinthe

experiment?Identifytheindependentvariables,dependentvariablesandcontrolvariablesinyour

experiment.

2. Carryoutabookandwebsearch.Collectmoreinformationaboutprojectilemotion.




Assessment:


P.1/2


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Factorsaffectingrangeofprojectile StudentManualDesign of the experiment (marks to be given in the report)

1. Makeanairtableorotherapparatusforstudyingprojectilemotion

2. Decreasetheaccelerationofthediscsothatslowmotioncanbedemonstrated

3. Maketheemitterfortheprojectile

Thispartshouldbesubmittedbeforetheexperiment. Commentswillbegivenandyourrevisedplanshouldbeincludedinthereport.

Implementation







Report

1. TheoryDraftshouldbesubmittedbeforetheexperiment.Eachgroup

2. ExperimentDesignandProcedure isrequiredtosubmitonesetonly3. Apparatus





Book/Website:__________________________________________________________




Work Schedule:

6Nov2010 SubmissionofExperimentDesign

13Nov2010 Trial/Preliminaryexperiment

20Nov2010 Experiment

27Nov2010 SubmissionofReport

P.2/2


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Factorsaffectingthestrengthofanelectromagnet StudentManualInvestigative Study To study the factors affecting the strength of an electromagnet

Task outline:

In this investigation, you are going to find the factors affecting the magnetic force produced by an

electromagnet and design experiments to show their relationships. You should collaborate with yourgroup-mates to complete the task. You should apply yourknowledge and skills inPhysics to solve the

problemsanddrawconclusionsbasedontheresultsobtained.







Apparatus:

SoftironC-core Ironplate Wrappingwire Lowvoltagepowersupply Ammeter Rheostat Switch G-clampsandwoodenblocks Stand Pulleyandstrings Weights Connectingwires Polystyreneboard Studentsarerecommendedtoproposeotherapparatusandmaterialsthatmaybeuseful.

P.1/3


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Factorsaffectingthestrengthofanelectromagnet StudentManualDiscussion:

1. Propose the factors that can affect the magnetic force of an electromagnet. Are these factors

changeable in the experiment? Identify the independent variables, dependent variables and control

variablesinyourexperiment.

2. Carryoutabookandwebsearch.Collectmoreinformationaboutelectromagnets.




Assessment:


Design of the experiment (marks to be given in the report)

1. Hypothesisandexperimentdesign

2. Dependent,independentandcontrolvariables

Thispartshouldbesubmittedbeforetheexperiment. Commentswillbegivenandyourrevisedplanshould

beincludedinthereport.

Implementation


2. Properuseofapparatus3. Properexperimentalskills




Report

1. TheoryDraftshouldbesubmittedbeforetheexperiment. Each2. ExperimentDesignandProceduregroup isrequiredtosubmitonesetonly3. Apparatus




P.2/3


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Factorsaffectingthestrengthofanelectromagnet StudentManualRecordformatforreferencematerials

Book/Website:__________________________________________________________




Work Schedule:

13Sep2010 SubmissionofExperimentDesign

21Sep2010 Trial/Preliminaryexperiment

28Sep2010 Experiment

4Oct2010 SubmissionofReport

sampletask phy e 20111019

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