Physics Form 4 Mid-year 2009

SULIT

Nama: ……………………………………. Tingkatan: ………………… 4531 Physics Form 4 Mei 2009 2 ½ hours

SEKOLAH MENENGAH KEBANGSAAN TUN MUTAHIR UJIAN PENGESANAN PERTENGAHAN TAHUN TAHUN 2009

FIZIK Dua jam tiga puluh minit

JANGAN BUKA KERTAS SOALAN INI SEHINGGA DIBERITAHU

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1. Kertas soalan ini mengandungi tiga bahagian: Bahagian A dan Bahagian B

Bahagian

Soalan

Markah Diperoleh

A

2. Jawab semua soalan dalam Bahagian A. Tuliskan

1 2 3 4 5 6 7 8 9 10 11

jawapan bagi Bahagian Adalam kertas jawapan objektif. 3. Jawab semua soalan daripada Bahagian B. Jawab

B

di ruang jawapan yang dusediakan. 4. Tunjukkan kerja mengira, ini membantu anda mendapatkan markah. 5. Sekiranya anda hendak membatalkan sesuatu

Jumlah

jawapan, buat garisan di atas jawapan itu. 6. Gambar rajah yang mengiringi soalan tidak dilukiskan mengikut skala kecuali dinyatakan. 7. Satu senarai rumus disediakan di halaman 2. 8. Markah yang diperuntukan bagi setiap soalan

Kertas soalan ini mengandungi 29 halaman bercetak

The following information may be useful. The symbols have their usual meaning.

Lihat Sebelah SULIT

5. F = ma

1. a =

v −u t

mv2

6. Kinetic energy =

1 2 2. v2= u2 + as

3. s = ut + at2

7. Potential energy = mgh

4. Momentum = mv

PART A: 30 Objective Questions. Answer all questions.

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1. Which of the following is a base S.I unit? A. Joule B. Kilogram C. Centimetre D. Celcius

2. The relationship between elastic potential energy, W with the compression, x, of a spring is

given by the equation,

, where k is the spring constant. What is the unit of k? W=

1 2 kx 2

A. 2 Nm B. 2 Nm-1 C. Nm D. Nm-1 3. Which of the following pairs is incorrect?

A B C D

Quantity Current Acceleration Work Momentum

Type of quantity Scalar Vector Scalar Scalar

4. Which one of the following statements is true? A The vernier calliper gives a more accurate measurement than a micrometer screw gauge. B The vernier caliper gives a measurement correct to 0.01mm. C A micrometer screw gauge gives a measurement correct to 0.01cm. D The vernier scale divides a 9mm length into 10 equal parts. 5. A mercury thermometer can be made more sensitive by A using a thicker-walled glass tube. B using a bigger glass bulb and a thinner wall. C using a smaller glass and a thicker wall. D using a bigger hairline tube. 6. From the following which is the method for reducing random error? 3

A Taking the zero error reading of the measuring instrument. B Calculating the average reading of the measurements. C Taking the measurement reading only once. D Conducting the experiment with different instruments. 7. For a target practice, which of the figure below shows low consistency and low accuracy?

8. A hypothesis is A an initial interpretation or explanation concerning the observation of a phenomenon B a prediction of what will occur in the future based on the analysis of present experimental data C a statement of an expected outcome that usually states the relationship between two or more variables D a conclusion based on the analysis of experimental data that usually states the relationship between two or more variables 9. A car is travelling at a speed of 90 km h-1. What is its speed in m s-1? A. 9 m s-1 B. 18 m s-1 C. 25 m s-1 D. 30 m s-1

10. Figure 1 shows a basketball falling through the net. 4

Figure 1

What is the physical quantity that is constant when the basketball falls? A. B. C. D.

Velocity Momentum Acceleration Kinetic energy

11. Which of the following symbols is a Sl base unit? A. N B. W C. K D. J

12. A boy starts from rest and moves with uniform acceleration until he reaches a velocity of 30 ms-1 in 5 second. What is the distance travelled by the boy? A. B. C. D.

6.0 m 10.0 m 50.0 m 75.0 m

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13. The diagram shows the path travelled by a boy. The total time taken by the boy is 25 seconds. What is the velocity of the boy? A 0 ms-1 B 2.0 ms-1 C 2.4 ms-1 D 3.6 ms-1

14. The diagram shows a ticker tape of a trolley moving down an inclined plan. The frequency of the ticker timer is 50 Hz.

Calculate the acceleration of the trolley in cm s-1. A. 1.5 B. 13.6

C. 150 D. 300 15. Which of the following displacement-time graphs shows that an object is not in motion?

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16. Figure 2 shows the velocity-time graph for a moving car.

Figure 2

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What are the values of the acceleration and displacement of the car? A B C D

Acceleration/ms-2 5.0 5.0 10.0 10.0

Displacement/ms-1 240.0 320.0 240.0 200.0

17. A bus is moving at a uniform speed. A passenger Jumps up vertically. Where will he land on the floor? A. At the original position B. At a position in front his original position C. At a position behind his original position D. At a position beside his original position

18. Which of the following objects travelling at the same speed will have the least inertia?

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19. Which of the following statements is not an example of conservation of momentum? A The explosion of a bomb B The bouncing motion of basketball with the ground C The motion of sound wave in air D The launching of a rocket

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20. Which object has the greatest momentum?

21. Calculate the impulse of a car of mass 2000 kg moving from rest and reach 4 ms-1 in 2 s. A. 4000 kg ms-1 B. 8000 kg ms-1 C. 12 000 kg ms-1 D. 16 000 kg ms-1

22. One of the safety features in a car is the front portion that crumples easily on an impact. This feature helps to A. reduce the mass of the car B. increase the inertia of the car C. reduce the air friction on the car 10

D. increase the impact time

23. Figure 3 shows two metal objects, fork and iron which were dropped from the 9th floor.

Figure 3

Which of the following statement is true when both objects were dropped? A. B. C. D.

The velocities of iron and fork are constant. The rate of change in velocity of iron and fork are the same. The momentum of iron and the fork are the same. The iron dropped faster than the fork.

24. Figure 4 shows two forces, F1 and F2 acting on a point O.

Figure 4

If the resultant force is 500 N, what are the magnitudes of the forces, F1 and F2? A B

F1 186 N 260 N

F2 150 N 200 N 11

C D

343 N 433 N A.

250 N 250 N

25. Figure 5 shows forces 47 N, 8 N, 23 N and 18 N acting on a point, Z.

Figure 5

Calculate the magnitude of the net force acting on point Z. A. 15 N B. 18 N C. 20 N D. 26 N

26. A boy of mass 55 kg is pushing a wall with a force of 500 N as shown in Figure 6

Figure 6

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Calculate the work done by the boy. A. 0 J B. 9 J C. 13 J D. 26 J

27. Figure 7 shows a helicopter rising vertically at a constant velocity.

Figure 7

Which of the following increase? A. B. C. D.

Weight Momentum Potential energy Kinetic energy

28. An electrical kettle is rated with power of 240 V, 1500 W operates for 20 minutes. If the efficiency of the electrical kettle is 85 %, how much heat energy is produced? A. 3 100 kJ B. 1 530 kJ C. 4 500 kJ D. 3 140 kJ

29. Figure 8 shows a spring is extended when a load of 4N is applied to it.

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Figure 8

The force constant of the spring is A. 9 Nm-1 B. 11 Nm-1 C. 25 Nm-1 D. 50 Nm-1

30. Three forces X, V and Z act simultaneously on object O. are in equilibrium. Which of the following vector diagrams correctly represents the three forces?

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PART B : 11 structured questions. Answer all questions. Write your answers in the spaces provided in the questions papers.

1.

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Figure 1 Figure 1 shows a measuring device. (a) Name the physical quantity measured by the device. [1mark] _________________________________________________________________________________

(b) What is the reading shown by the device? [1mark] _________________________________________________________________________________

(c) Explain how you would check for the zero error of this device. [1mark] _________________________________________________________________________________

(d) Mark and label on Figure 1 the part that helps to reduce error. [1mark] 16

_________________________________________________________________________________

2. Figure 2 shows a vernier calipers used to measure the external diameter of a hollow PVC pipe.

Figure 2

(a) (i) Name the part labelled Y. [1 mark] _________________________________________________________________________________

(ii) What is the function of V? [1 mark] _________________________________________________________________________________

The external diameter of the PVC pipe is measured at four different places, the readings are recorded in the table below

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(b) Why is the external diameter measured four times? [1 mark] _________________________________________________________________________________

(c) What is the purpose of calculating relative deviation? [1 mark] _________________________________________________________________________________

3.

Diagram 3(i) shows a wooden block of mass 2 kg is placed on a rough surface horizontally.

Diagram 3(i)

Diagram 3(ii)

When the wooden block is pulled by a force, F= 5 N and it moves with constant velocity.

(a)

(i) Explain why a wooden does not move if it is pulled by 3 N.

______________________________________________________________________________ [1 mark] (ii) What is the resultant force when F = 5 N acts on the wooden block? ______________________________________________________________________________ [1 mark]

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(iii) What is the magnitude of frictional force acting on the woodenblock (a)(ii)? ______________________________________________________________________________ [1 mark]

(b) Force P N acted on the block as shown in diagram 3(ii). Acceleration of the wooden block is 2.5 ms-1. Calculate the magnitud of P.

[2 marks]

4. Figure 4 shows a man standing on a stationary boat. He then jumps out of the boat onto the jetty. The boat moves away from the jetty as he jumps.

Figure 4

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(a) State the physics principle that is involved in the movement of the boat as the man jumps onto the jetty. ______________________________________________________________________________ [1 mark] (b) Explain why the boat moves away from the jetty when the man jumps. ______________________________________________________________________________ [1 mark] (c) The mass of the man is 50 kg and he jumps at a velocity of 2 m s-1.. The mass of the boat is 20 kg. Calculate the velocity of the boat as the man jumps.

[2 marks]

(d) Name one application of the physics principle stated in (a) in an exploration of outer space. ______________________________________________________________________________ [1 mark] 5.

Diagram 5 shows a boy extending the elastic rubber of a catapult.

Diagram 5 20

(a) State the change of energy when the stone is released from the catapult. ______________________________________________________________________________ [1 mark]

(b) What happens to the distance of movement of the stone when a bigger mass of stone is used ? ______________________________________________________________________________ [1 mark] (c) The mass of the stone used is 0.02 kg. When the elastic rubber is extended 0.2 m by a force of 10 N.

(i) calculate the potential energy stored in the elastic rubber ? [2 marks]

(ii) what is the velocity of the stone when the catapult. is released . [2 marks]

6.

Figure 6 shows the velocity-time graph for a motorcycle undergoing a speed test.

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Figure 6

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

(ii) Mark with a cross (x) the point where the motorcycle begins to move with non-uniform acceleration on the graph in Figure 6. [1 mark] _________________________________________________________________________________

(b) Calculate the uniform acceleration of the motorcycle. [2 mark]

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(c) The speed test was repeated with an additional person on the motorcycle. (i) On Figure 6, sketch the new velocity-time graph. [1 mark]

(ii) Give one reason for your answer in (c)(i). [1 mark] _________________________________________________________________________________

7.

Diagram 7.1 and 7.2 show two watermelons fall off a table and drop on to surface A and

surface B respectively.

Diagram 7.1

Diagram 7.1

(a) What is meant by impulse? ______________________________________________________________________________ [1 mark] (b) With reference to Diagram 7.1 and Diagram 7.2, (i) Compare the force on the watermelons that strike on Surface A and Surface B. ______________________________________________________________________________ [1 mark] (ii) Compare the time of impact of the watermelons on Surface A and Surface B. ______________________________________________________________________________ [1 mark]

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(c) Mark with a (√) for the correct statement about the change of momentum of the watermelons in both situations above. [1 mark]

The change of momentum of the watermelon in Diagram 7.1 is greater than that of the watermelon in Diagram 7.2.

The change of momentum of the watermelon in Diagram 7.2 is greater than that of the watermelon in Diagram 7.1.

The change of momentum of the watermelon in Diagram 7.1 is equal to that of the watermelon in Diagram 7.2.

(d)

Suggest a suitable material for surface B.

______________________________________________________________________________ [1 mark]

Diagram 7.3 24

(e) By referring to the Diagram 7.3. explain how the driver is able to avoid serious injuries when the car stopped suddenly.

______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ [2 mark]

Figure 8

8.

Figure 8 shows a stroboscopic photograph of an athlete doing the long jump in a sports event.

The stroboscopic lamp emits light at a frequency of 40 Hertz. (a) What is the time interval between two consecutive images in the photograph? [1 mark] _________________________________________________________________________________

(b) Calculate (i) the average velocity of the participant between positions K and L. [2 marks]

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(ii) the average velocity of the participant between positions M and N, [2 marks]

iii) the acceleration of the participant over the distance KM. [2 marks]

(c) Starting from position N, the participant jumps and lands at point S. The average horizontal velocity during the jump is 21 m s-1. Calculate the distance of the jump. [ 2 mark]

(d) The participant bends his knees on landing. Explain why the participant does so based on a principle in physics. [ 1 mark] _________________________________________________________________________________

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Figure 9 9.

Figure 9 shows a student uses a disc with a diameter of 60 cm to measure the distance

between two points A and B in the school science garden. By pushing the disc from A to B, he can measure the distance, L, using the formula L = (0.6πn) meter where n is the number of complete rotations of the disc and π = 3.142. He did five measurements of the distance from A to B using the disc and Table1.1 shows the result of the measurements.

Table 9 (a) When the student presented Table 9 to his teacher, his teacher advised him to discard the fourth measurement. (i)

Explain why he is advised to discard the fourth measurement? [1 mark]

_________________________________________________________________________________

(ii) Give one possible reason how did the student get the value of n of the fourth measurement. [1 mark] _________________________________________________________________________________ 27

(b) Using the first, second, third and fifth measurements, calculate (i)

the min value of n,

[2 mark]

(ii) the distance, L from A-to B using the formula provided. [2 mark]

(c) Another student suggested measuring the distance from A to B directly using a measuring tape. Explain the disadvantage of using a measuring tape.

[1 mark]

_________________________________________________________________________________

10.

Figure 10 shows a feather and a small plasticine ball are released from the same height. The

mass of the feather and plasticine ball are the same.

Figure 10.1

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The velocity-time graph for the two objects are shown in Figure 10 .2

Figure 10.1 (a) Name two forces acting on the feather and the plasticine ball. [2 marks] i)

______________________________________________

ii)

______________________________________________

(b) Using Figure 10.1, compare the surface area of the feather and the plasticine ball.

_________________________________________________________________________________ [1 mark] (c) Using the graph in Figure 10.2 , compares the changes in the velocity of the feather and the plasticine ball. [3 marks]

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_________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________

(d) Using your answers in (b) and (c), state the relationship between the surface area and the final velocity. [1 mark] _________________________________________________________________________________

(e) The feather and the plasticine ball are now dropped in a vacuum. Sketch a velocity-time graph in graph below to show the motion of both objects. [ 2 marks]

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11. Diagram 11 shows a wooden block placed on a trolley at a certain height on a runway. The system is left to slide down the runway at constant speed of 4 ms-1.

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Diagram 11 (a)

On Diagram 11 label the direction of forces acting on the trolley at the stationary state. [1 mark]

(b)State energy changes experiences by the system as it moves down the runway

[2 marks]

(c)

The total mass of the wooden block and the trolley is 6 kg. As the system slide down the runway , the motion is blocked by a book as shown on the diagram. Calculate the momentum of the wooden block and the trolley before they hit the book.

[2 marks]

(d)

(i) What happens to the wooden block when the trolley hits the book?

[1 mark]

(ii) Explain answer in (d)(i) .

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[1 mark]

END OF QUESTION PAPER

Disediakan oleh

Disemak oleh

En.Saleh Abdul Wahid

Pn Ashta Letchumi

Guru Mata Pelajaran Fizik

Ketua Bidang Matematik & Sains

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