Content Domain Main Topic Cognitive Domain PhysICs...

187

Main TopicContent Domain Cognitive Domain

Overall Percent Correct

Country average vs. International average:

Higher pNotdifferent OLower q

TIMSS 2003 8th-Grade Science Concepts and Science Items

PhysICs ElectricityandMagnetism ConceptualUnderstanding

Polesoncutmagnet

Item Number: S022035

sCORINGNote:Toreceivecredit,thepolarityofBOTHendsofthecenterpiecemustbeindicated.Answeriscorrectifpolarityisindicatedcorrectly(N-S),butlettersareshownabove,below,oroutsidetheboxes,aslongasthepolarityofbothendsofthecenterpieceisclear.

Correct Response

• N-S

Incorrect Response

• S-N

• Poleofcutendsofouterpiecesareindicated(S-N)insteadofpolesoncenterpiece.

• Otherincorrect(includingcrossedout/erased,straymarks,illegible,orofftask).

S022035

The diagram shows a bar magnet which is cut into three pieces with ahacksaw.

Write an “N” or an “S” in each box on the diagram to show the polarity ofeach end of the center piece.

N

North

S

South

Japan 64 pSingapore 62 pMacedonia, Republic of 62 pKorea, Republic of 59 pBahrain 58 pSweden 58 pLithuania 56 pBelgium (Flemish) 55 pCyprus 53 pRussian Federation 52 pNew Zealand 51 pAustralia 51 pUnited States 51 pEstonia 51 pSerbia and Montenegro 51 pIsrael 51 pNetherlands 49 OBulgaria 48 OItaly 48 OMorocco 47 OScotland 47 OMoldova, Rep. of 46 ORomania 46 OEngland 46 OLatvia 45 OSlovenia 45 OInternational average 44 OChinese Taipei 44 OSlovak Republic 43 OHungary 43 OMalaysia 43 ONorway 41 OHong Kong, SAR 40 qBotswana 39 qJordan 38 qSaudi Arabia 37 qLebanon 36 qChile 35 qPhilippines 34 qTunisia 33 qIndonesia 32 qIran, Islamic Republic of 32 qEgypt 30 qPalestinian Nat’l Auth. 27 qArmenia 25 qGhana 19 qSouth Africa 17 q

188

student Responses


Polesoncutmagnet(continued)Item Number: S022035

Correct Response:

Incorrect Response:

Correct Response:

189






PhysICs ElectricityandMagnetism FactualKnowledge

Diagram of batteries in a flashlight


A

S012037

The diagrams show a flashlight and three ways to put batteries in it.

+ – +– +– + –+– +–

In order to make the flashlight work, which way must the batteries beplaced?

a Only as in K

b Only as in L

c Only as in M

d None of these ways would work.

K L M

Singapore 97 pEngland 95 pKorea, Republic of 93 pJapan 93 pHong Kong, SAR 93 pRussian Federation 93 pSlovak Republic 93 pEstonia 93 pChinese Taipei 92 pMalaysia 91 pRomania 91 pLatvia 91 pHungary 91 pBulgaria 91 pBahrain 90 pLithuania 90 pMoldova, Rep. of 90 pSweden 89 pUnited States 89 pArmenia 88 pNew Zealand 88 OSlovenia 87 pLebanon 86 ONetherlands 86 OAustralia 85 OBelgium (Flemish) 85 OCyprus 85 OInternational average 85 OScotland 84 OIndonesia 84 OSerbia and Montenegro 84 OMacedonia, Republic of 84 OItaly 83 OIran, Islamic Republic of 83 OChile 82 OIsrael 82 ONorway 81 qBotswana 81 qMorocco 81 OJordan 78 qSaudi Arabia 78 qPalestinian Nat’l Auth. 78 qPhilippines 77 qEgypt 67 qTunisia 59 qGhana 55 qSouth Africa 52 q

190






PhysICs ElectricityandMagnetism ReasoningandAnalysis

Compassplacednexttoamagnet/draw

Item Number: S032625A

S032625

The diagram above shows a compass needle with its North and Southpoles labeled (N and S). It is placed next to a strong magnet as shown in thediagram below.

A. Draw the compass needle in the circle on the diagram above.Label the North (N) and South (S) poles of the needle.

B. Explain your answer using your knowledge of magnets.

N S

N

S

sCORINGCorrect Response

• Drawsa“horizontal”needlewithNtotheleftandStotheright.[Seediagrambelow.]

Note:Creditshouldbegivenevenifonelabelismissing(NtotheleftORStotherightshown).

Incorrect Response

• Drawsa“horizontal”needlewithpolesreversed(Ntotherightand/orStotheleft).[Seediagrambelow.]

• Drawsa“horizontal”needlewithnopolesindicated.[Seediagrambelow.]

• Drawsa“vertical”needlewithorwithoutpolesindicated.[Seediagrambelow.]


Japan 88 pKorea, Republic of 87 pChinese Taipei 86 pSingapore 76 pSlovak Republic 74 pHungary 67 pEngland 65 pHong Kong, SAR 61 pMalaysia 58 pBulgaria 57 pBahrain 56 pArmenia 54 pSweden 52 pAustralia 50 pRussian Federation 48 pRomania 45 pSerbia and Montenegro 45 pUnited States 45 pNetherlands 44 OIran, Islamic Republic of 43 OScotland 41 OInternational average 40 OJordan 38 OMoldova, Rep. of 37 OItaly 33 qMacedonia, Republic of 33 qPalestinian Nat’l Auth. 33 qLebanon 31 qNew Zealand 31 qNorway 30 qEstonia 29 qMorocco 28 qIsrael 27 qIndonesia 26 qEgypt 26 qSlovenia 25 qBelgium (Flemish) 25 qTunisia 24 qLatvia 23 qLithuania 21 qCyprus 20 qPhilippines 17 qSaudi Arabia 16 qChile 15 qBotswana 14 qSouth Africa 5 qGhana 2 q

191

student Responses


Compassplacednexttoamagnet/draw(continued)Item Number: S032625A

Correct Response:

Incorrect Response:

192






Item Number: S032625B

Compassplacednexttoamagnet/explain

PhysICs ElectricityandMagnetism ReasoningandAnalysis

ScoringforExplanationCorrect Response

• Explainsthatoppositepolesattract(NtowardS,etc.)orlikepolesrepel(orsimilar).Examples: The south point of the compass is attracted to the north pole of the magnet. North and south attract together. The magnets which have different poles attract one another. The N pole on the magnet will attract the S pole on the compass. Opposites attract and likes repel. The magnet pushes the N pole of the compass away.

• Othercorrect.

Incorrect Response

• Referstomagneticattraction/repulsionbutwithanincorrectapplication.Examples: Because the same pole will be attracted. The magnet is closer to the compass and will have a stronger attraction to the N end. The needle of the compass is metal, so it is attracted to the magnet and turns. It attracts the needle to North and South poles.

• ExplainsthatthecompassneedlealwayspointsNorth,orsimilar.Examples: The needle of North always goes to the magnetic North. North always goes toward North.


S032625




N S

N

S

Korea, Republic of 81 pJapan 77 pChinese Taipei 70 pSingapore 67 pHungary 59 pEngland 59 pSlovak Republic 56 pHong Kong, SAR 47 pArmenia 45 pBahrain 43 pMalaysia 43 pBulgaria 42 pAustralia 41 pIran, Islamic Republic of 40 pSweden 39 pUnited States 37 pSerbia and Montenegro 37 pRomania 33 ONetherlands 31 OJordan 30 OPalestinian Nat’l Auth. 30 OInternational average 29 ORussian Federation 29 OMoldova, Rep. of 28 OScotland 28 OMacedonia, Republic of 21 qItaly 20 qIndonesia 20 qEgypt 17 qNew Zealand 17 qIsrael 16 qLebanon 16 qMorocco 14 qEstonia 13 qNorway 13 qBotswana 11 qBelgium (Flemish) 11 qSlovenia 10 qSaudi Arabia 9 qTunisia 9 qPhilippines 8 qLatvia 8 qChile 5 qLithuania 5 qSouth Africa 4 qCyprus 4 qGhana 2 q

193

student Responses


Correct Response:

S032625




N S

N

S

Compassplacednexttoamagnet/explain(continued)Item Number: S032625B

194


Incorrect Response:

S032625




N S

N

S

Compassplacednexttoamagnet/explain(continued)Item Number: S032625B

student Responses(continued)

Correct Response:

195






PhysICsEnergyTypes,Sources

andConversionsConceptualUnderstanding

Storedenergyintwosprings


B

S012002

Spring 1 and Spring 2 were the same. Then, Spring 1 was pushed together alittle and clamped in place. Spring 2 was pushed together a lot andclamped.

Which spring has more stored energy?

a Spring 1

b Spring 2

c Both springs have the same energy.

d You cannot tell unless you know what the springs are made of.

1 2

Singapore 84 pEngland 84 pKorea, Republic of 84 pUnited States 83 pNew Zealand 83 pJapan 81 pNetherlands 79 pAustralia 78 pScotland 78 pEstonia 77 pHungary 75 pItaly 75 pNorway 74 pLithuania 74 pRussian Federation 73 pBelgium (Flemish) 71 pSweden 71 pIsrael 70 pHong Kong, SAR 69 pSlovenia 68 pMalaysia 67 pLatvia 64 OChinese Taipei 64 OLebanon 63 OJordan 63 OInternational average 62 OBulgaria 61 OArmenia 60 OChile 59 OCyprus 58 OIndonesia 57 qIran, Islamic Republic of 56 qMacedonia, Republic of 56 qSerbia and Montenegro 55 qBotswana 52 qPalestinian Nat’l Auth. 50 qPhilippines 48 qSlovak Republic 47 qMorocco 46 qRomania 39 qSouth Africa 39 qEgypt 39 qMoldova, Rep. of 38 qSaudi Arabia 37 qGhana 36 qBahrain 35 qTunisia 28 q

196






PhysICsEnergyTypes,Sources

andConversionsConceptualUnderstanding

Nailpulledoutofawoodenboard


sCORINGCorrect Response

• Explanationreferstofriction(implicitlyorexplicitly).Examples: Because it is rubbed against the wood. Nail resists when you pull it out. Because of the force on the nail to pull it out. Because of friction. There is friction between the nail and the wooden board.

• Explanationreferstoenergychange.Examples: There is more energy in the nail after the transition. Because energy is used to get it out. Kinetic energy changes to heat energy when you pull it out.

• Othercorrect.

Incorrect Response

• Explanationrefersonlytothenailortheactiontakenwithinadequateconnectiontofrictionorenergy.Examples: It is hard to get it out. You must pull hard. Because it was in the wood for too long.


S032131

When a nail is pulled out of a wooden board, the nail becomes warm.Explain why.

Chinese Taipei 84 pHungary 84 pSlovak Republic 78 pEngland 75 pHong Kong, SAR 74 pJapan 74 pUnited States 73 pRussian Federation 72 pLithuania 72 pNetherlands 71 pAustralia 71 pKorea, Republic of 70 pLatvia 68 pSingapore 67 pEstonia 66 pScotland 66 pArmenia 66 pBelgium (Flemish) 64 pRomania 64 pMalaysia 63 pMoldova, Rep. of 62 pBulgaria 61 pNew Zealand 57 OSlovenia 54 OInternational average 52 OIran, Islamic Republic of 52 OSweden 51 OIsrael 48 ONorway 47 qJordan 44 qCyprus 44 qSerbia and Montenegro 44 qMacedonia, Republic of 41 qPalestinian Nat’l Auth. 40 qItaly 40 qChile 40 qIndonesia 39 qBahrain 33 qMorocco 27 qTunisia 27 qSaudi Arabia 26 qPhilippines 24 qLebanon 22 qEgypt 20 qBotswana 11 qSouth Africa 11 qGhana 5 q

197

student Responses


Nailpulledoutofawoodenboard(continued)Item Number: S032131

Correct Response:

Incorrect Response:

Correct Response:

198






PhysICs ForcesandMotion ConceptualUnderstanding

Pathofballreleasedfromorbit


A

S022040

The diagram on the left shows a ball on the end of a string being whirled ina circle. The diagram on the right shows the whirling ball as viewed fromabove.

After several whirls, the string is released when the ball is at Q. Which ofthese diagrams shows the direction in which the ball will fly the instant thestring is released?

Q

(View from above)

Q

Q

Q

a b

c d

Korea, Republic of 87 pNetherlands 82 pEstonia 80 pSingapore 79 pAustralia 77 pJapan 77 pHungary 77 pScotland 77 pNew Zealand 77 pBelgium (Flemish) 76 pUnited States 76 pLithuania 75 pMalaysia 75 pSweden 74 pEngland 74 pRussian Federation 74 pSlovak Republic 72 pNorway 72 pLatvia 71 pSlovenia 70 pHong Kong, SAR 69 pChinese Taipei 68 pItaly 61 OBulgaria 60 OSerbia and Montenegro 60 OInternational average 60 OCyprus 59 OIsrael 58 ORomania 58 OChile 58 OArmenia 58 OMacedonia, Republic of 54 qMoldova, Rep. of 52 qIran, Islamic Republic of 48 qJordan 47 qIndonesia 47 qBahrain 44 qPhilippines 42 qSaudi Arabia 38 qPalestinian Nat’l Auth. 36 qMorocco 33 qTunisia 31 qEgypt 30 qLebanon 30 qBotswana 30 qSouth Africa 22 qGhana 22 q

Correct Response: A

199







Whyheliumballoonmovesupward


S032281

A balloon filled with helium gas is set free and starts to move upward.Which of the following best explains why the helium balloon moves upward?

a The density of helium is less than the density of air.

b The air resistance lifts the balloon up.

c There is no gravity acting on helium balloons.

d The wind blows the balloon upward.

Korea, Republic of 89 pHungary 88 pSlovak Republic 86 pChinese Taipei 86 pEstonia 83 pSingapore 81 pSlovenia 79 pSweden 77 pRussian Federation 75 pJapan 74 pUnited States 72 pHong Kong, SAR 71 pMalaysia 69 pLithuania 69 pNorway 69 pScotland 69 pLatvia 69 pNew Zealand 67 pEngland 66 pAustralia 66 pSerbia and Montenegro 65 pRomania 65 pItaly 61 OBulgaria 60 OInternational average 58 ONetherlands 58 OJordan 56 OMoldova, Rep. of 56 OArmenia 56 OIsrael 54 qChile 52 qMacedonia, Republic of 52 qPalestinian Nat’l Auth. 50 qPhilippines 49 qBelgium (Flemish) 49 qLebanon 47 qEgypt 45 qBahrain 43 qIran, Islamic Republic of 38 qCyprus 35 qSaudi Arabia 33 qIndonesia 32 qGhana 28 qBotswana 25 qSouth Africa 21 qTunisia 21 qMorocco 19 q

200







Metalcrown:whyscientistsrepeatedmeasurement

Item Number: S032712A

S032712

The scientists measured the volume of the crown five times. They computedthe density for each volume measurement. Their results are shown in thetable below.

Trial Volume of Crown (cm3) Density of Crown (g/cm3)

1 202 11.88

2 200 12.00

3 201 11.94

4 198 12.12

5 199 12.06

A. Why did the scientists measure the volume five times?

B. The scientists reported to the king that the density of the crown was12.0 g/cm3. Show how the scientists used their results to obtain thisvalue for the density.

Questions for Metal Crown continue.

Chinese Taipei 76 pKorea, Republic of 67 pEstonia 60 pSingapore 58 pHong Kong, SAR 56 pJapan 53 pMalaysia 53 pLithuania 53 pBelgium (Flemish) 47 pUnited States 47 pAustralia 44 pJordan 44 pSlovenia 42 pSweden 42 pScotland 41 pNew Zealand 40 pPalestinian Nat’l Auth. 38 pSlovak Republic 34 OEngland 34 ONetherlands 33 OIsrael 33 OInternational average 30 OMoldova, Rep. of 30 OLatvia 29 OEgypt 29 ORussian Federation 26 qSerbia and Montenegro 23 qNorway 22 qHungary 22 qCyprus 21 qMorocco 21 qTunisia 19 qIran, Islamic Republic of 18 qBahrain 17 qMacedonia, Republic of 15 qIndonesia 15 qItaly 15 qRomania 14 qBulgaria 13 qArmenia 11 qBotswana 10 qPhilippines 8 qChile 6 qLebanon 6 qSouth Africa 6 qGhana 5 qSaudi Arabia 1 q

201


sCORING

WhyScientistsRepeatMeasurementsCorrect Response

• Referstoaccuracy,precision,reliability,experimentaluncertainty,estimationofmeasurementerror(orsimilar).Examples: Because there is experimental error. So measuring it 5 times you can calculate

the average to know how much error there is. Each time they measure the volume it is close but not exactly the same. So, it’s better

to measure it a few times to be sure. They want a more exact answer. To get an accurate measure of the volume. It’s more reliable.

• Refersonlytocomputinganaverageormeanvalue(ormedianorrange).Examples: To find the average volume. To work out the mean.

• Othercorrect.

Incorrect Response

• Refersonlyto‘mistakes’orchangesinthemeasurements(orsimilar);noexplicitmentionofaccuracy,precision,experimentaluncertainty,etc.Examples: In case mistakes happen. To make sure it wasn’t changing. To make sure the answer was right and he did not make a mistake. To make sure they did it right. To check if it was correct.

• Refersonlytoa‘fairtest’orsimilar;noexplicitmentionofcomputationofaverage,accuracy,precision,experimentaluncertainty,etc.Examples: To make sure it was a fair test. To ensure a fair test.

• Otherincorrect(includingcrossedout/erased,straymarks,illegibleorofftask).

Metalcrown:whyscientistsrepeatedmeasurement(continued)Item Number: S032712A

202

student Responses


Correct Response:

Incorrect Response:

Metalcrown:whyscientistsrepeatedmeasurement(continued)Item Number: S032712A

203






Item Number: S032712B

Metalcrown:determinationofaverage/medianvalue


sCORINGCorrect Response• Shows(ordescribes)acorrectmethodforcomputingtheaverage(mean)value.

Examples: (11.88+12.00+11.94+12.12+12.06) = 60. 60/5=12.0 (202+200+201+198+199)/5 = 200. 2400/200=12.0 They added together all of the densities and then divided by 5 to get the average.

• Shows(ordescribes)acorrectmethodfordeterminingthemedianvalue.Examples: 202, 201, 200, 198, 199. 200 is the median volume, so 2400/200 is the median density

(12). 12 is the middle value when placed in order (12.12, 12.06, 12.00, 11.94, 11.88).

• Othercorrect

Incorrect Response• Statesthatitistheaverage,meanormedianvaluewithnoorincorrectworkshown.

• Showsacomputationofdensity(mass/volume).[Nodeterminationofaverageormedianincluded.]Examples: They did mass divided by volume. 2400g/200cc = 12 g/cc


S032712

The scientists measured the volume of the crown five times. They computedthe density for each volume measurement. Their results are shown in thetable below.

Trial Volume of Crown (cm3) Density of Crown (g/cm3)

1 202 11.88

2 200 12.00

3 201 11.94

4 198 12.12

5 199 12.06

A. Why did the scientists measure the volume five times?

B. The scientists reported to the king that the density of the crown was12.0 g/cm3. Show how the scientists used their results to obtain thisvalue for the density.

Questions for Metal Crown continue.

Singapore 47 pJapan 44 pEstonia 36 pLithuania 31 pUnited States 29 pNetherlands 29 pChinese Taipei 28 pScotland 26 pSweden 24 pHong Kong, SAR 24 pAustralia 23 pEngland 22 pLatvia 22 pNew Zealand 21 pMalaysia 20 pBelgium (Flemish) 20 pKorea, Republic of 15 ONorway 14 OSlovenia 14 OInternational average 14 OIsrael 13 OMoldova, Rep. of 13 OHungary 12 qSerbia and Montenegro 11 qSlovak Republic 10 qRussian Federation 10 OCyprus 9 qBulgaria 9 qRomania 7 qJordan 7 qMacedonia, Republic of 7 qArmenia 6 qItaly 6 qLebanon 6 qIndonesia 4 qTunisia 4 qPhilippines 4 qEgypt 4 qBahrain 3 qPalestinian Nat’l Auth. 3 qChile 3 qMorocco 3 qBotswana 2 qIran, Islamic Republic of 2 qSouth Africa 1 qGhana 1 qSaudi Arabia 0 q

204

student Responses


Metalcrown:determinationofaverage/medianvalue(continued)Item Number: S032712B

Correct Response:

205

student Responses


Metalcrown:determinationofaverage/medianvalue(continued)Item Number: S032712B

Incorrect Response:

Correct Response:

206






D


Extrapolationofdistance/timegraph

PhysICs ForcesandMotion ReasoningandAnalysis

S022041

The graph shows the progress made by a beetle moving along a straightline.

If the beetle keeps moving at the same speed, how long will it take totravel 10 cm?

a 4 seconds

b 6 seconds

c 20 seconds

d 25 seconds

Dis

tance

(cm

)

Time (seconds)

5 10 15 20 25 30

14

12

2

10

8

6

4

0

Netherlands 91 pSingapore 90 pKorea, Republic of 90 pJapan 89 pMalaysia 89 pBelgium (Flemish) 89 pScotland 88 pAustralia 87 pUnited States 87 pHungary 86 pEngland 85 pSweden 84 pHong Kong, SAR 84 pLithuania 83 pNew Zealand 82 pEstonia 82 pChinese Taipei 80 pSlovenia 80 pLatvia 79 pIsrael 79 pRussian Federation 79 pNorway 75 pItaly 74 OChile 73 OMoldova, Rep. of 73 OBulgaria 71 OInternational average 71 OLebanon 70 OCyprus 68 OSlovak Republic 68 ORomania 67 OBotswana 64 qMacedonia, Republic of 64 qMorocco 61 qIndonesia 61 qBahrain 58 qIran, Islamic Republic of 56 qArmenia 56 qSerbia and Montenegro 55 qTunisia 55 qJordan 54 qPhilippines 52 qEgypt 51 qPalestinian Nat’l Auth. 44 qSaudi Arabia 40 qSouth Africa 35 qGhana 32 q

Correct Response:

207







Controlledexperimentwithcart


E

S022222

The diagrams show nine different trials Michael carried out using carts with

wheels of two different sizes and different numbers of blocks of equal mass.

He used the same ramp for all trials, starting the carts from different heights.

He wants to test this idea: The higher the ramp is placed, the faster the cart

will travel at the bottom of the ramp. Which three trials should he compare?

a G, H and I

b I, W and Z

c I, V and X

d U, W and X

e H, V and Y

U

G

ZY

H I

V W

X

Singapore 79 pJapan 78 pKorea, Republic of 75 pHong Kong, SAR 66 pEngland 65 pChinese Taipei 63 pNetherlands 59 pMalaysia 58 pAustralia 58 pScotland 58 pUnited States 57 pHungary 56 pLithuania 54 pNew Zealand 54 pEstonia 51 pSweden 48 pBelgium (Flemish) 48 pRussian Federation 47 OSlovenia 45 OArmenia 45 OItaly 44 OInternational average 43 OSlovak Republic 43 OLatvia 42 ONorway 41 OIsrael 41 OSerbia and Montenegro 39 qBahrain 37 qRomania 36 qBulgaria 36 qJordan 35 qCyprus 34 qChile 33 qSaudi Arabia 32 qMacedonia, Republic of 31 qLebanon 31 qIran, Islamic Republic of 31 qMoldova, Rep. of 30 qPhilippines 30 qPalestinian Nat’l Auth. 25 qIndonesia 25 qEgypt 23 qBotswana 23 qTunisia 23 qMorocco 22 qSouth Africa 18 qGhana 18 q

208







Datatrendofmassesonspring


S022286

The table below shows the results of an experiment to investigate how thelength of a spring changes as different masses are hung from it.

Mass (grams) Length of Spring (cm)

0 5

10 7

20 9

30 11

40 12

50 13

60 13

Describe how the length of the spring changed as different masses werehung from it.

Singapore 75 pHungary 73 pSlovak Republic 71 pKorea, Republic of 68 pChinese Taipei 67 pEstonia 66 pNew Zealand 65 pArmenia 65 pChile 62 pItaly 60 pJapan 56 pNorway 56 pAustralia 55 pHong Kong, SAR 55 pSerbia and Montenegro 53 pLithuania 52 pSweden 50 pSlovenia 49 pLatvia 47 OIran, Islamic Republic of 46 pUnited States 45 ONetherlands 45 ORussian Federation 43 OBulgaria 42 OInternational average 42 OIsrael 41 OMoldova, Rep. of 40 OBelgium (Flemish) 39 OJordan 37 qMacedonia, Republic of 36 qRomania 36 qPalestinian Nat’l Auth. 35 qScotland 34 qMalaysia 33 qEgypt 33 qEngland 30 qPhilippines 29 qSaudi Arabia 27 qCyprus 26 qLebanon 20 qIndonesia 17 qMorocco 17 qBahrain 13 qTunisia 12 qBotswana 7 qSouth Africa 6 qGhana 2 q

209


sCORINGNote:Toreceivecredit,responsesmustaddresstwobasicregionsinthetabletodescribethetrendinspringlengthasafunctionofthemassadded:

(i)initially,thespringincreasesinlength(ataconstantrate)asmoremassisadded.

(ii)afterapoint(40grams),thespringlengthstartstoleveloffandthenremainsconstantasmoremassisadded.

Responsesmaybequantitativeorqualitativeinnature.[Nocreditislostforusingwrongornounitsindescribinglengthormass.]

Correct Response

• Responseincludesbothregions(i)and(ii).Examples: At low mass, it grew 2 for every 10 grams. Then it changed by 1 at 40g. Then at 50g,

it did not grow any more. It increases by 2’s until 30, increases by 1’s until 50, and increases by 0 at 60. The length increased steadily up to 40g, and then it increased just a little bit more

until it was 13cm at 50 and 60 grams. At first it got longer every time you added a mass, but then after a while, it did not

get any longer.

• Othercorrect.

Incorrect Response

• Includesonlyregion(i).Responsereferencesonlyanincreaseinlengthasmoremassisaddedbutdiscussionoflevelingoffisinadequateormissing.Examples: The length increased as more mass was added. The spring length got 2cm longer with each mass. It increased by 2cm each time until 40 grams.

• Refersonlytolevelingoffofspringlengthordecreasingincrementsathighermasses.[Descriptionofchangeinregion(i)isinadequateormissing.]Examples: It stretches but only up to 13 cm. After 50 grams it did not change. It stretches less at higher masses.


Datatrendofmassesonspring(continued)Item Number: S022286

210

student Responses



Correct Response:

211



student Responses (continued)

Incorrect Response:

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