exam final year 09 f4 p2

7/28/2019 Exam Final Year 09 F4 p2

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Section A

[60 marks]

Answerall questions in this section.

1. Diagram 1 shows a stopwatch.

a) Name the physical quantity measured by the stopwatch.

[1 mark]

b) State the unit used by this stopwatch.

[1 mark]

c) What does the pointer P indicate?

[1 mark]


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3. Diagram 3.1 shows an airplane maintaining a steady and level flight under the

influence of four forces.

Diagram 3.2 shows a load hanging from the middle of the string. T1 and T2 are tension

of the string and W is the weight of the load. The dotted line shows the resolved

component of the tensions T1 and T2.

Diagram 3.1 Diagram 3.2

a) What is meant by weight?

[1 mark]

b) Based on Diagram 3.1 and Diagram 3.2,

i) compare the forces acting on the airplane

vertically :

horizontally :

[2 marks]

ii) compare the forces acting on the load

vertically :

horizontally :

[2 marks]

c) Compare the type of motion of the airplane and the object.

[1 mark]


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d) Based on your answer in 3 (b) and 3 (c), relate the type of motion with the resultant

forces acting on the aeroplane or on the load.

[1 mark]

e) Name the phenomenon shown in Diagram 3.1 and Diagram 3.2.

[1 mark]

4. Diagram 4.1 (a) shows Beckham kicking a football and Diagram 4.1 (b) shows

Beckham kicking a rock.

Diagram 4.1

a) Define impulsive force.

...

[1 mark]

b) The ball in Diagram 4.1 has a mass of 1.5 kg. When Beckham kicks the ball, it movesfrom rest to 20 ms-1 in 0.2 s. Calculate the impulsive force that Beckham exerted on

the ball.

[2 marks]


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c) The rock in Diagram 4.1 (b) has the same mass with the ball (1.5 kg). When Beckam

kicks the rock, it moves from rest to the same velocity as the ball (20 ms -1). However,

due to the rigidity of the rock, the time which Beckhams foot is in contact with the

rock is only 0.02 s. Calculate the impulsive force that Beckham exerted on the rock.

[2 marks]

d) Compare time of impact in Diagram 4.1 (a) with Diagram 4.1 (b).

...

[1 mark]

e) Compare the impulsive force in Diagram 4.1 (a) with Diagram 4.1 (b).

...

[1 mark]

f) Compare the pain experience by Beckham in Diagram 4.1 (a) with Diagram 4.1 (b).

...

[1 mark]

g) Based on your answer in (d), (e) and (f), state the relationship between time of impact,

impulsive force and pain experienced by Beckham.

[1 mark]

h) Suggest one way how Beckham could reduce his pain in Diagram 4.1(b).

[1 mark]


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5. Diagram 5.1 shows a concrete water tank filled with water.

Diagram 5.1

a) State a factor that affects the water pressure in the tank.

...

[1 mark]

b) Compare the water pressure at P and Q.

...

[1 mark]

c) Calculate the water pressure at Q.

(Density of water = 1 000 kg m-3)

[2 marks]

d) Diagram 5.2 shows water flows from the concrete to the house water tank.

Diagram 5.2


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i) What is the factor that causes the water to flow from the concrete tank to the water

tank in the house?

...

[1 mark]

ii) The flow of water from the concrete tank to the house will stop at level P. Explain why

the supply stops.

...

...

[2 marks]

e) i) Suggest two modifications that can be done to ensure the water flow

continuously to the house water tank.

...

...

[2 marks]

ii) Draw a water tank that can withstand high water pressure.

[1 mark]

6. Diagram 6.1 and 6.2 shows two ventury tubes for the purpose of studying the

relationship between the velocity of fluid and pressure.

Diagram 6.1


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Diagram 6.2

a) State the similarities of cross section area, velocity and pressure at point A and E, if A

is compared to points B and C in Diagram 6.1 and E is compared to points D and F in

Diagram 6.2.

i) Cross section area : ..

Velocity :...

Pressure : ..

[3 marks]

b) Based on the answers in 6(a) name the physics principle involved.

...

[1 mark]

c) Mark the water level at A, B and C in Diagram 6.1.

[1 mark]

d) Compare the pressure at D, E and F in Diagram 6.2 when water is flowing.

...

...

[2 marks]

7. Diagram 7.1 shows a metal P at 1000C being placed in a beaker of water at 280C. After

a few minutes thermal equilibrium state is achieved. The mass of metal P and the

water are 0.4 kg and 0.2 kg respectively.

Diagram 7.2 shows a temperature against time graph of the water in the beaker.


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Diagram 7.1 Diagram 7.2

a) What is the meaning of thermal equilibrium?

...

[1 mark]

b) Based on the graph in Diagram 7.2, what is the temperature when the thermal

equilibrium is achieved?

...

[1 mark]

c) What is the purpose of wrapping the beaker with cotton layer?

...

[1 mark]

d) Calculate the specific heat capacity of metal P.

(specific heat capacity of water is 4200 J kg-1 0C-1)

[2 marks]

e) State the assumption you made in (d).

...

[1 mark]


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8. Diagram 8.1 shows that during day time the air molecule is warm on land compared to

the sea.

Diagram 8.1

a) On Diagram 8.1 complete the warm air cycle.

[2 marks]

b) Why does the warm air rise?

...

[1 mark]

c) Name the phenomenon involved in Diagram 8.1.

...

[1 mark]

d) Explain the formation of the phenomenon occurred in Diagram 8.1.

...

...

...

[3 marks]


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e) Diagram 8.2 shows a Malaysian flag mounted to wave on a land near a seashore.

Diagram 8.2

i) On Diagram 8.2, mark with an arrow to show the direction of the flag.

[1 mark]

ii) Explain your answer in (e) (i).

...

...

[2 marks]


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(b) Diagram 9.2 shows a copper block and a bowl shape copper sheet of same mass.Explain why the copper block sink in water but the bowl shape copper sheet floats

on water.

[4 marks]

(c) Diagram 9.3 shows a barge used to transport goods from fresh water port to theship anchored away from the seaside.

Using suitable physics concepts, explain the required modification needed in

designing a barge that can carry more and heavier goods, move faster and safe in

fresh and salt water.

You can emphasise on the following aspects in your modification;

i. material used

ii. plimsoll line

iii. shape and size of the barge

[10 marks]


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10.

Figure 10 (a) Figure 10.2 (b)

Figure 10 (a) shows a boy pouring hot coffee into a cup. The hand of the boy is not scalded

by the coffee droplets that are spattered from the kettle.

Figure 10 (b) shows hot coffee spilling over and getting onto his hand and his hand gets

scalded because of the heat capacity in it.

a) What is meant by heat capacity?

[1 mark]

b) Using diagrams 10 (a) and 10 (b), compare the situations when the coffee droplets spatters

on his hand and when the hot coffee from the kettle spills onto his hand.

State the relationship between the heat capacity and the mass.

[5 marks]

I. Explain why water is normally used as a cooling agent in a car engine.[4 marks]

II. An aluminium pan of mass 500 g is heated from 25 C to 105 C. How much heat isabsorbed by the pan?

[The specific heat capacity of aluminium is 910 J kg 1 C 1 ]

[4 marks]

III. As a researcher, you wish to produce an ideal cooking pan which saves gas for thepurpose of cooking. Using the appropriate physic concepts, suggest and explain the

modifications required.

[6 marks]


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SECTION C

[20 marks]

Answer any one question.

11. You are a coach responsible to choose a student to join the school basket ball team. Abasic physical fitness test was carried out and the results based on certain

characteristics are as shown in table 11.1.

Table 11.1

a) What is meant by power?

[1 mark]

b) Based on table above, explain the suitable characteristics of the student to be in the

basket ball team. Choose which student will be in the basketball team and explain your

choice.

[10 marks]

c) When a100 m runner reached the finish line, the runner stopped suddenly and fell on

the ground. Explain the situation using the appropriate physics concept.

[4 marks]

characteristics

students

Mass

(kg)

height

(m)

Responding

Time

(s)

Power (time taken to

transfer 50 bricks to a

distance of 5 m)

(minutes)

Time taken to

complete 100 m

run

(s)

A 70 1.30 0.01 4 11.0

B 65 1.50 0.20 3 10.6

C 50 1.70 0.01 2 10.5

D 60 1.40 0.05 2 11.2

E 40 1.60 0.04 1 12.4


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d) Two students were asked to run up the stairs to the top floor of a 10 m building. Data

obtained for the two students are shown by table 11.2.

Table 11.2

Calculate power of each student and determine which student has the highest power.

[5 marks]

12. Diagram 12.1 shows the air balloon which is used as a weather balloon to carry a

radiosonde instrument for collecting data about the atmosphere. The weather balloon

rises up in the air due to Archimedes principle.

Diagram 12.1

a) i) State Archimedess principle.

[1 mark]

ii) Explain why a weather balloon that is rising up in the air will stop at certain

altitude.

[4 marks]

Mass

(kg)

Time

(s)

Student 1 55 12

Student 2 60 14


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b) Table 12.2 shows the characteristics of four weather balloons P, Q, R and S.

Balloons

Characteristics of the balloons

Size of balloon Density of filled gasin the balloon

(kg m-3)

Type of balloonfabric

Mass of radiosonde

(kg)

P Big 0.090 Canvas 4.5

Q Small 0.178 Synthetic nylon 3.0

R Big 0.178 Synthetic nylon 0.5

S Medium 1.429 Canvas 0.4

Table 12.2

You are required to determine the most suitable weather balloons which is able to carry the

instrument to a higher altitude in a shorter time.

Study the characteristics of all the four weather balloons which from the following aspects:

- The size of the balloon- The density of filled gas in the balloon- Type of the fabric of the balloon- Mass of radiosonde instrumentExplain the suitability of the aspects. Justify your choice.

[10 marks]


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c) Diagram 12.3 shows a balloon which contains helium. The volume of the balloon is

1.2 m3. Density of helium gas is 0.18 kg m-3.

Diagram 12.3

i) By neglecting the mass of the balloon, calculate the mass of helium gas in the balloon.

[2 marks]

ii) Calculate the buoyant force which acts on the balloon.

(Density of air is 1.3 kg m-3)

[3 marks]

END OF QUESTION PAPER

exam final year 09 f4 p2

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