# Midyear f4 SMART09

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CONFIDENTIAL 4531/2

SULIT 4531/2 Physics Paper 2 Mei 2009 MID YEAR EXAMINATION FORM 4 PHYSICS Paper 2 2 ½ hours

DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO

1. This question paper consists of three 2. 3.

4. 5. 6. 7. 8.

9. 10. 11.

For Examiner’s Use Only Section

Question 1(11 M) 2(5 M) 3(7 M) 4(6 M) 5(7 M)

A

6(6 M) 7(7 M) 8(9 M) 9(6 M) 10(10 M) 11(6 M) TOTAL

B

1(20 M)) 2(20 M)

TOTAL

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Marks

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The following information may be useful. The symbols have their usual meaning. v−u t

1.

a=

2.

v 2 = u 2 + 2as

3.

s = ut +

4.

Momentum = mv

5.

F = ma

6.

Kinetic energy =

7.

Gravitational potential energy = mgh

8.

Elastic potential energy =

1 2 at 2

1 2 mv 2

1 Fx 2 9.

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g = 10 m s-2

2

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Section A [ 60 marks ] Answer all questions in this section. ( You are advised to spend 120 minutes on this section ) 1. (a) Write the value and symbols of the following prefixes : Prefix

Value

Symbol

tera nano giga deci centi [ 5 marks ] (b) . Write the following physical quantities using the suggested standard prefix. (i) Wavelength of light

= 0.000 000 55 m = …………….. nm

(ii) Radio wave frequency = 91 000 000 Hz = …………… MHz [2 marks]

(c) State if each of the following physical quantities is a scalar quantity or a vector quantity. (i) (ii)

Temperature :______________________ Force

: _____________________

(ii)

Electric current : ___________________

(iii)

Momentum [ 4 marks ]

2.

Ali , Wong and Raju were asked to measure the diameter of a test tube in the laboratory. The actual diameter of the test tube given by the manufacturer is 2.75 cm. Each of them measured the diameter three times at three different places on the test tube. The measurements are shown in the table. Student Ali Wong Raju

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2.69 2.83 2.74

3

Diameter / cm 2.67 2.91 2.76

2.68 2.85 2.75

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(a)

What instrument can be used to measure the diameter of the test tube? …………………………………………………………………………..

(b)

What instrument should we use to get readings that are more accurate?

[1 mark]

………………………………………………………………………

(c)

[1 mark]

From the three sets of measurements, determine (i)

which set is accurate and consistent ………………………………………………………………..

(ii)

which set is consistent but not accurate ………………………………………………………………..

(iii)

which set is not consistent and not accurate ……………………………………………………………….. [3 marks]

3. (a)

Name the appropriate instruments and its accuracy to measure. Instrument (i) the time taken by an athlete to run in a 100 metre race

Accuracy

(ii) height of a door (iii) internal diameter of a glass [ 3 marks ]

(b) A student measures the diameter of a test tube using a pair of vernier calipers. The figure above shows the reading he obtained. (i) Write down the reading. --------------------------------------------------------------------------------------------Nfmn/smart 09 4531/2

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[ 1 mark ] (ii) The student was told by the teacher to record another two readings. If 2.05 cm and 2.06 cm are the second and third readings he recorded, calculate the mean diameter. [ 2 marks ] (iii) What is the purpose of recording 3 readings ? --------------------------------------------------------------------------------------------[ 1 mark ]

4.

Figure 4(a) and Figure 4(b) show the same micrometer screw gauge before and after it is used to measure the thickness of a 200 pages of book. (a) Name and define the error shown in Figure (a). --------------------------------------------------------------------------------------------------[ 1 marks ] (b) Write down the reading shown on Figure (a). --------------------------------------------------------------------------------------------------[ 1 mark ] (c) Write down the reading shown on Figure (b). --------------------------------------------------------------------------------------------------[ 1 mark ] (d) What is the thickness of the book ?

[ 1 mark ] (e) Calculate the thickness of one sheet of paper from this book and express your answer in standard form.

[ 2 marks ]

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5. Diagram 5 shows vernier calipers used to measure the length a piece of mosaic.

2

3

Diagram 5 (a) (i) Name the part labeled X ----------------------------------------------------------------------------------------------[ 1 mark] (ii) What is the function of X ? ---------------------------------------------------------------------------------------------[ 1 mark ] (b) How to improve the accuracy of the readings ? ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------[ 2 marks ] (c) (i) What is length of the mosaic ? --------------------------------------------------------------------------------------------------[ 1 mark ] (ii) If the mosaic is square, how many pieces of mosaic are needed for 2400 m2 room ?

[ 2 marks ]

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6. Diagram 6.1 shows the initial reading of a stopwatch at the beginning of an experiment. The stopwatch was used to measure the time for 20 complete oscillations made by a simple pendulum of length, l. Diagram 7.2 shows the reading of the stopwatch at the end of the experiment.

DIAGRAM 7.1

(a) (i)

(ii)

DIAGRAM 7.2

State the type of error shown in Diagram 7.1. ……...……………………………………..…………………………………….. [1 mark] What is the actual time taken for the pendulum to complete 20 oscillations? ……...……………………………………..…………………………………….. [1 mark]

(b) (i)

Find the period of one complete oscillation, T, for this pendulum.

[2 marks]

(ii)

The relationship between the length, l, and the period, T, of a simple pendulum is

 g 2  4π

given by the equation, l = 

 2 T . 

Using the value of T obtained in (b)(i), calculate the length, l, of the pendulum. [ Given that π = 3.142 and g = 10 m s-2]

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7. A car moves with an average speed of 75 km h-1 from town P to town Q in 2 hours as shown in Diagram 8. By using this information, you may calculate the distance between the two towns.

Diagram 8 (a) (i) Based on the statements given, state two base quantities and their respective SI units. …………………………………………………………………………………... …………………………………………………………………………………... [2 marks] (ii) State a derived quantity and its SI unit. ………………………………………………………………………………….. [1 mark] (iii) Calculate the distance between town P and Q. [2 marks]

(b) Calculate the volume of a wooden block with dimensions of 7 cm length, 5 cm width and 12 cm height in m3 and express the answer in scientific notation.

[2 marks]

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8. The figure below shows the speed-time graph for the first 80 s of the journey of a van.

(a)

During the motion shown, describe what happens to (i) the speed of the van. ---------------------------------------------------------------------------------------------[ 1 mark ] (ii) the acceleration of the van. --------------------------------------------------------------------------------------------[ 1 mark ]

(b) Calculate the acceleration of the van during the first 30 s. [ 2 marks ]

(c) Determine the maximum speed of the van in kmh-1.

[3 marks ] (d) The van decelerates uniformly to rest from t = 80 s to t = 120 s. Complete the graph and obtain the speed of the van when t = 100 s Nfmn/smart 09 4531/2

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Speed of the van = ___________________________ [ 2 marks ] 9. Diagram 9.1 and Diagram 9.2 show two identical eggs released from the same height and drop on to Surface A and Surface B respectively.

Egg

Egg

Does not break

Surface A DIAGRAM 9.1

Breaks

Surface B DIAGRAM 9.2

(a) What is meant by impulse? .........…………………………………………………………………………………… [1 mark] (b) With reference to Diagram 9.1 and Diagram 9.2; (i)

Compare the force on the eggs that strike Surface A and Surface B.

(ii)

.....................…………………………………………………………………….. [1 mark] Compare the time of impact of the eggs on Surface A and Surface B.

.....................…………………………………………………………………….. [1 mark] (iii) Compare the change in momentum of the eggs in both situations. .....................…………………………………………………………………….. [1 mark] (iv)

State the relationship between the force produced in a collision and the time of impact. .....................…………………………………………………………………….. [1 mark]

(v)

Suggest a suitable material for Surface A. .....................……………………………………………………………………..

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[1 mark] 10. Diagram 10.1 shows a boy , whose mass is 40 kg is running towards a 2 kg skateboard with a velocity of 20 ms-1. The boy then jumps onto the skateboard and moves forward. Diagram 10.2 shows a frog with a mass of 100 g which is at rest on a 10 g stationary leaf. The frog then jumps from the leaf to the river bank.

Diagram 10.1

Diagram 10.2

a) Observe Diagram 10.1 and Diagram 10.2 and compare the type of movement of the boy after jumping onto the skateboard and the frog after jumping from the leaf to the river bank. ……………………………………………………………………………………… ……………………………………………………………………………………… [2 marks] b) (i) Compare the total momentum for the boy before and after he jumps onto the skateboard. …………………………………………………………………………………. [1 mark] (ii) Calculate the velocity of the boy after he jumps onto the skateboard. Nfmn/smart 09 4531/2

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[2 marks] (iii) State the principle involved. ………………………………………………………………………………… [1 mark]

c) A girl whose mass is 30 kg runs with the velocity of 20 ms -1 to the identical skateboard as shown in Diagram 11.1. (i) Calculate the momentum of the girl. [2 marks] (ii) Compare the total momentum between the girl and the boy in Diagram 11.1. …………………………………………………………………………………... [1 mark] (iii Give your reason for your answer in (c) (ii). …………………………………………………………………………………... [1 mark]

11. A rock climber climbs up a rock surface with the help of a rope tied to a tree. (a) State the force that’s the climber must work against as he climbs. --------------------------------------------------------------------------------------------------Nfmn/smart 09 4531/2

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[ 2 marks ] (b) One climber weighs 900 N and another weighs 1000 N. Which one has to do the most work ? --------------------------------------------------------------------------------------------------[ 1 marks ] (c) (i)

What type of energy do the climbers gain when they reach the top ? -----------------------------------------------------------------------------------------[ 1 marks ]

(ii)

What is the differences in the energy gained by both climbers ? [ 2 marks ]

Section B [ 20 marks ] Answer any one question from this section The time suggested to answer this section is 30 minutes 1

Figure 1.1

Figure 1.2

Based on Figure 1.1 and Figure 1.2, a lorry driver finds it is difficult to get the lorry moving when it is fully loaded compared to an empty lorry. He also find it is difficult to stop for a fully loaded lorry compared to an empty one. Based on the above situation,

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(a) state a concept of physics involved. [ 1 mark ] (b) explain the factor for causing the driver to experience the situation as described in (a). [ 4 marks ]

Figure 1.3 (c ) Figure 1.3 shows a car moving at constant velocity. (i) What is meant by constant velocity? [ 1 marks ] (ii) Based on the concept of physics that is applicable, explain how the car can be designed to protect the driver from serious injuries in accidents. [ 10 marks ] (d) The car in Figure 1.3 is moving with a constant velocity. State the forces acting on the car. What is the relationship between the forces? [ 4 marks ]

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2

Diagram 9.1 and Diagram 9.2 shows a comparison of two springs, M and N. Both the springs are elasticity made from the same wire and material. They are attached to load of equal weight.

Spring M Spring N

DIAGRAM 9.1

DIAGRAM 9.2

(a) What is meant by elasticity of a material [ 1 mark] (b)

Based on Diagram 9.1 and Diagram 9.2 Compare the forces applied on the springs and the extension of the springs. [3 marks]

( ii)

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Compare the spring constant M and N , hence relate the spring constant and the natural length of the spring. [ 2 marks]

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(c)

A spring produces an extension of 4 cm when a stretching force of 1.2 N is applied to it. What is the spring constant of the spring ?

(d)

Explain how the forces between the molecules caused the elasticity . [4 marks] spring in suspension system

DIAGRAM 9.3 (e)

Diagram 9.3 shows a spring of suspension system of an ordinary motorcycle. (i) What are the functions of the spring in the suspension system ? [2 marks] (ii) Explain the modification that needs to be done on the spring to enable it to be a racing motorcycle. You should explain your suggestions, to include the following aspects : - the characteristics of the spring material - the designs of the spring [6 marks]

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ANALISIS KERTAS 2 FIZIK TINGKATAN 4 2009 NAMA :………………………………………………………. KELAS:……………………………………………………….. SOALAN

TAJUK

MARKAH PENUH

1

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MARKAH TINDAKAN DIPEROLEHI