PeKA - DINAMIC

PeKA Science F2 SMAPT

Measuring and using numbersTable & Observation

Making inferences (Inferring)

CommunicatingNote: Pupils may use reference materials in conducting this activity

Interpreting dataTable & Observation

Defining operationally

Controlling variablesRV, MV, CV

Making hypothesis

Making conclusion

LEARNING AREA : FORCE

LEARNING OBJECTIVE : APPLICATION OF FRICTIONAL FORCE

CHAPTER : 7 - DYNAMICS

NAMA :

NO. I/C :

ANGKA GILIRAN :

KELAS :

TAHUN PMR :

C16

C3

C4

C6

2012

C8

C11

C9

C10

http://nazuris.blogspot.com/


1.0 LEARNING OBJECTIVE : APPLICATION OF FRICTIONAL FORCEAPLIKASI DAYA GESERAN

2.0 AIM : To study the effect of different types of surfaces on the magnitude of frictoinal forceUntuk mengkaji kesan permukaan yang berlainan ke atas magnitud daya geseran

3.0 HYPOTHESIS : The tougher the surface, the greater the magnitude of the frictional force onthe wooden blockSemakin kasar permukaan, semakin tingggi magnitud daya geseranyang bertindak ke atas bongkah kayu

a b

4.0 VARIABLE : [i] MANIPULATED : Types of surfacesJenis permukaan lantai

[ii] RESPONDENT : Magnitude of frictional force / reading of spring balanceMagnitud daya geseran / Bacaan neraca spring

[iii] CONSTANT : Size of wooden blockSaiz bongkah kayu

a b c a b

5.0 APPARATUS : Spring balance, thread, wooden block, table, oil/grease, aluminium foil,sandpaper, graph paperNeraca spring, benang, meja, bongkah kayu, minyak/gris, aluminium foil,kertas pasir, kertas graf

6.0 PROCEDURE :[steps]

[1] The apparatus setup is shown in the figureSusunan radas adalah seperti dalam gambarajah

[2] Wooden block is hooked to a spring balance with a threadBongkah kayu diikat pada neraca spring dengan menggunakan benang

[3] The wooden block is then placed on the surface on the tablebongkah kayu kemudian diletakkan di atas permukaan meja

[4] The wooden block is pulled along the table and the reading of the spring balance is takenwhen the block start movebongkah kayu ditarik dan bacaan neraca spring diambil apabila bongkah kayumula bergerak

[5] The experiment is repeated by pulling the wooden block on the three other differenttypes of surfacesEksperimen diulang dengan menggunakan tiga jenis permukaan lantai yang berlainaniaitu aluminium foil, kertas pasir, minyak/gris

[6] All the reading were recorded in a tableSemua bacaan direkodkan ke dalam jadual

a b c

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[figure]

7.0 OBSERVATION [table, graph & observation]

Table of result :

a b c d e f

Graph [refer attachment]

a b c d e

[1] Reading of spring balance represents the?Bacaan neraca spring mewakili?

magnitude of frictional forcemagnitude daya geseran

[2] The reading of spring balance just before / when objects starts to move represents?Bacaan neraca spring sejurus sebelum / semasa objek mula bergerak mewakili?

maximum magnitude of frictional forcemagnitud maksimum daya geseran

[3] Does the different types of surfaces affect the magnitude of frictional force?Adakah jenis permukaan yang berlainan akan mempengaruhi daya geseran?

Yes, the different types of surfaces affect the magnitude of frictional forceYa, jenis permukaan yang berlainan akan mempengaruhi nilai geseran

a b c d

Sangat LicinVery Rough

Sangat Kasar

KasarSmooth

LicinVery Smooth

Type of surface Condition of Surface Reading of Spring BalanceJenis Permukaan Keadaan Permukaan Bacaan Neraca Spring

Aluminium FoilLapisan Aluminium

OilMinyak

SandpaperKertas Pasir

5.8 N

4.5 N

3.6 N

Wooden TableMeja Kayu

Rough

6.5 N

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C6

C3



8.0 DISCUSSSION & ANALYSIS [questions and answers][answer the question given]

[1] Between the different types of surfaces, which gives theDi antara pelbagai jenis permukaan, yang manakah memberikan

[i] Greatest magnitude of frictional forceMagnitude daya geseran yang paling tinggi

The surface of sandpaper gives the greatest magnitude of frictionPermukaan kertas pasir memberikan magnitude daya geseran tertinggi

[ii] Lowest magnitude of frictional forceMagnitud daya geseran paling rendah

The oily surface gives the lowest magnitude of frictionPermukaan yang berminyak memberikan magnitud daya geseran paling rendah

[2] What is the condition of surface that cause theDalam keadaan permukaan apakah yang akan menyebabkan

[i] increase the frictional force on the wooden blockMeningkatkan daya geseran bongkah kayu

The rough surface increase the frictional force of wooden blockpermukaan yang kasar akan meningkatkan magnitud daya geseran

[ii] decrease the frictional force on the wooden blockmengurangkan daya geseran bongkah kayu

The smooth surface decrease the frictional force of wooden blockpermukaan yang licin akan mengurangkan magnitud daya geseran

[3] Arrange in descending order of the types of surfaces based on the magnitude of frictional force.Susun jenis permukaan lantai secara menurun berdasarkan magnitud daya geseran

Sandpaper > Wooden table > Aluminium foil > oil/greaseKertas > meja kayu > Aluminium foil > permukaan berminyak/gris

a b c a b c d

[4] Define operationally frictional forceBerikan definisi secara operasi daya geseran untuk eksperimen ini

- Frictional force is the reading of spring balance when the wooden block is pulled onthe surface

- Frictional force varies with / depends on the type of surface

- Daya geseran diwakili bacaan neraca spring sejurus bongkah kayu di ataspermukaan lantai ditarik

- Daya geseran bergantung kepada jenis permukaan

a b

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[5] What can you infer from the results of the experiment?Apakah yang dapat disimpulkan melalui eksperimen di atas?

The types of surfaces influences the magnitud of frictional forceJenis permukaan mempengaruhi magnitud daya geseran

[6] Suggest way(s) to decrease frictonal force on the surface of the tableCadangkan cara bagaimana dapat mengurangkan daya geseran permukaan meja

We can reduce friction by putting oil/grease/aluminium foil on the surfaceof tableGeseran dapat dikurangkan dengan meletakkan minyak/gris/aluminium foilpada permukaan meja

a b c

9.0 CONCLUSSION

[1] Do different types of surfaces change the magnitude of friction?Adakah jenis permukaan yang berlainan mempengaruhi magnitud geseran?

Different types of the surfaces can changes the magnitude of frictional forceJenis permukaan yang berlainan mempengaruhi magnitud daya geseran

a b

Graph [attachment]

a b c d eC6

C16

C4

Bar chart : Magnitude of frictional force by type of surface

Woo

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Tabl

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Kay

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Alu

min

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Foi

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Oil

/ Min

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Type of Surface

Mag

nitu

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f Fric

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