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BENGKEL TEKNIK

FIZIK Tingkatan 4

2015

Maktab Tentera

Diraja

Penceramah : Thong Kum Soon

Paper3 Planning experiment 1.

Success is depend on your mind and your will.

You are the one, who decide it. PROVE IT!!

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4. A boy pushes the boxes along a level walkway as shown in Diagram 3.1 The boy experiences that the boxes move slowly.

When the boy removes one of the boxes as shown in Diagram 3.2, he experiences that the boxes move faster than

before although the same force was applied.

Seorang budak lelaki menolak beberapa buah kotak di sepanjang satu laluan seperti yang

ditunjukkan dalam Rajah 3.1. Budak lelaki itu mendapati kotak-kotak bergerak sangat

perlahan. Apabila budak lelaki itu mengeluarkan satu daripada kotak-kotak itu seperti

ditunjukkan dalam Rajah 3.2, dia mendapati kotak-kotak itu boleh digerakkan lebih laju,

walaupun daya yang sama dikenakan.

Diagram 3.1 Diagram 3.2

With the use of apparatus such as trolleys, ticker timer, ticker tape, elastic cord and other apparatus, describe an experiment

framework to investigate the hypothesis stated in 3(b).

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Paper 3 Part A No 1

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6. A student carried out an experiment to find out the relationship between mass, m, and the square of

oscillation period, T2, of plasticine, and to determine the tension in the saw blade while oscillating. The

student carried out the experiment with five different mass, m.

Seorang murid telah menjalankan suatu eksperimen bagi mengkaji hubungan di antara jisim, m, dan kuasa dua

kepada tempoh ayunan, T2, bagi plastesin, dan untuk menentukan nilai tegangan dalam bilah gergaji semasa

berayun. Murid tersebut telah menjalankan eksperimen tersebut dengan lima nilai jisim, m, yang berlainan.

The results of the experiment are shown on a graph of T2 against m as in Figure 2.1

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Keputusan eksperimen itu ditunjukkan pada graf T2 melawan m di Rajah 2.1.

FIGURE 2.1 / RAJAH 2.1

(a) Based on the graph in Figure 2.1,

Berdasarkan graf pada Rajah 2.1,

(i) state the relationship between T2 and m.

nyatakan hubungan di antara T2 dan m.

………………………………………………………………………[1 mark / markah]

(ii) determine the period, T of oscillation when the mass, m = 30.0 g.

Show on the graph, how you determine the period, T.

tentukan tempoh, T, ayunan apabila jisim, m = 30.0 g. Tunjukkan pada graf, bagaimana anda

menentukan tempoh, T.

T2 / s2

m/ g

Graph of T2 against m

Graf T2 melawan m

60.0 10.0 20.0 30.0 40.0 50.0 70.0

0.4

0.8

1.2

1.6

2.0

2.4

2.8

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T = …………………………. [3 marks / markah]

(b) The tension, F, in the saw blade produced while it is oscillating, is given by the following equation:

Daya tegangan, F, dalam bilah gergaji yang terhasil semasa ia berayun diberikan oleh persamaan

berikut:

where k is the gradient of the graph of T2 against m. di mana k ialah kecerunan bagi graf T

2 melawan m. di

mana k adalah kecerunan bagi graf T2 melawan m.

(i) Determine the gradient of the graph T2 against m.

Show on the graph how you determine the gradient.

Tentukan kecerunan bagi graf T2 melawan m. Tunjukkan pada graf bagaimana anda menentukan kecerunan

tersebut.

k = ………………………….

[3 marks / markah]

(ii) Using the equation F = k

20125.0 , calculate the tension in the saw blade, F.

Dengan menggunakan persamaan F = k

20125.0 , hitung tegangan di dalam bilah gergaji, F.

F = ……………………………

[2 marks / markah]

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(c) The same experiment is carried out by using a different saw blade. Using the equation:

Eksperimen yang sama dijalankan menggunakan bilah gergaji yang lain. Dengan menggunakan persamaan:

F = 2

20125.0T

m

calculate the tension, F, in the new saw blade when the mass, m, of the plasticine used is 100 g and the period of

oscillation, T = 4.0 s.

hitung tegangan, F, dalam bilah gergaji yang baru apabila jisim, m, plastesin yang digunakan adalah 100 g dan

tempoh ayunan, T = 4.0 s.

F = …………… [2 marks / markah]

(d) State one precaution that should be taken during the experiment.

Nyatakan satu langkah berjaga-jaga yang perlu diambil sepanjang eksperimen tersebut.

…………………………………………………………………………………………….………[1 mark / markah]

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[10 marks]

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10. Diagram 2.1 and Diagram 2.2 shows two identical eggs released from the same height and drop on surface A

and surface B respectively.

Rajah 2.1 dan Rajah 2.2 menunjukkan dua biji telur yang serupa dilepaskan dari ketinggian yang sama dan

jatuh di atas permukaan A dan permukaan B masing-masing.

Diagram 2.1 Diagram 2.2

(a) (i) What is meant by impulse? [ 1 mark ]

Apakah maksud impuls? [1 markah ]

Surface A

Egg

Surface B

Egg

Breaks Does not break

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(ii) Using Diagram 2.1 and Diagram 2.2, compare the force on the eggs , the time of impact and

the change in momentum that strike surface A and surface B.

[ 3 marks ]

Menggunakan Rajah 1.1 dan Rajah19.2. bandingkan daya yang dikenakan keatas telur,

masa tindakan dan perubahan momentum yang dikenakan pada permukaan A dan

permukaan B. [ 3 markah ]

(iii) State the relationship between the force on the eggs and the time of impact on surface A

and surface B. [ 1 mark ]

Nyatakan hubungan antara daya ke atas telur dan masa tindakan pada permukaan A dan

permukaan B. [ 1 markah ]

(b) Diagram 2.4 shows the speed limit and the load limit of heavy vehicles such as buses and lorries.

Rajah 2.4 menunjukkan had laju dan had muatan bagi kenderaan berat seperti bas dan lori.

Diagram 2.4

(i) Using concept of momentum and inertia, explain why the speed limit and load limit must be

imposed on heavy vehicles. [ 5 marks ]

Dengan menggunakan konsep momentum dan inersia, terangkan mengapa had laju dan had

muatan mesti dikenakan ke atas kenderaan berat [ 5 markah ]

(c) Diagram 2.5 shows a car speeding on a road. Diagram 2.6 shows the car crashed on an object. Due to the lack of safety features, the driver

sustained serious injury.

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Diagram 2.5 Diagram 2.6

The following are few facts concerning the car:

(i) The car stopped too suddenly upon hitting the object

(ii) The driver was thrown out of the car, breaking the glass of the windscreen.

(iii) Sharp pieces of glass from the shattered windscreen cut the head of the driver.

(iv) The accident occurred at night. The driver did not see the object until it was very near.

(v) The front part of the car collapse

Berikut adalah beberapa fakta tentang kereta itu :

(i) Kereta itu berhenti dalam masa terlalu singkat semasa menempuh objek itu. (ii) Pemandu kereta dihumban keluar daripada kereta lalu memecahkan cermin depan kereta. (iii) Serpihan kaca daripada cermin depan yang pecah menghiris kepala pemandu. (iv) Kemalangan berlaku pada waktu malam.Pemandu kereta tidak nampak objek depan sehingga

ia sangat dekat. (v) Bahagian depan kereta kelihatan kemek.

Based on the above facts, suggest various features to be added to the car to improve its safety standard and

explain how each feature can help to reduce injury of the driver. [10 marks]

Berdasarkan fakta-fakta di atas, cadangkan ciri-ciri yang boleh dipasangkan pada kereta untu

menambahbaikkan mutu keselamatan. Terangkan bagaimana setiap cirri boleh mengurangkan kecederaan

pemandu kereta. [10 markah]