Physics – Year 9 – Track 3 – 2017 Page 1 of 11

DIRECTORATE FOR QUALITY AND STANDARDS IN EDUCATION

Department of Curriculum Management

Educational Assessment Unit

Annual Examinations 2017

YEAR 9 PHYSICS TIME: 2 hours

Name: _______________________________ Class: _________________

INFORMATION FOR CANDIDATES

• Where necessary take acceleration due to gravity ‘g’ to be 10 m/s2.

• The use of a calculator is allowed.

• The number of marks for each question is given in brackets [ ] at the end of each question.

• You may find these equations useful.

Density m = ρ V

Pressure P = ρ g h F = P A

Forces W = m g

Moments Moment = F × perpendicular distance

Energy P. E. = m g h K. E. =

1

2mv2 Work Done = F s

Work Done = Energy Converted E = P t

Heat ΔQ = m c Δθ

INSTRUCTIONS TO CANDIDATES

• Use blue or black ink. Pencil should be used for

diagrams only.

• Read each question carefully and make sure that you

know what you have to do before writing your

answer.

• Answer ALL questions.

• All working must be shown.

For Examiner’s Use Only

Question Max Mark

1 8

2 8

3 8

4 8

5 8

6 15

7 15

8 15

Written 85

Practical 15

Total 100

This document consists of 11 printed pages.

Track 3

Page 2 of 11 Physics – Year 9 – Track 3 – 2017

SECTION A

Each question carries 8 marks. This section carries 40 marks of the total marks for this paper.

1.

a) Explain the term ‘non-renewable source of energy’.

___________________________________________________________________________[1]

b) State which of the following sources of energy are renewable and which are non-renewable.

Source of Energy Renewable or Non-Renewable

Wind

Oil

Nuclear

[3]

c) Give ONE advantage and ONE disadvantage of:

i) Solar energy

Advantage:___________________________________________________________ [1]

Disadvantage:_________________________________________________________ [1]

ii) Coal:

Advantage:___________________________________________________________ [1]

Disadvantage:_________________________________________________________ [1]

2. Martina of weight 450 N, stands on her

tiptoes as shown in Figure 1. This is a type

of lever. The ball of the foot is the pivot,

the force in the muscle is the effort 𝐸

needed to overcome Martina’s weight.

a) If Martina is in equilibrium calculate

the effort 𝐸 in Martina’s muscle.

__________________________________

__________________________________

_____________________________________________________________________________

_____________________________________________________________________________

___________________________________________________________________________[2]

Figure 1

Physics – Year 9 – Track 3 – 2017 Page 3 of 11

b) If Martina had more weight, would she need to make a larger or a smaller effort? Explain.

_____________________________________________________________________________

___________________________________________________________________________[2]

c) A lever can be used to move a large load by exerting a smaller force. Figure 2 below shows

such a uniform lever of weight 10 N being used to move a load of 500 N.

Figure 2

i) The total length of the lever is ___________________ m. [1]

ii) The distance 𝑥 is _____________________________ m. [1]

iii) Calculate the size of the smallest value of 𝐹 needed to move the load.

__________________________________________________________________________

__________________________________________________________________________

________________________________________________________________________[2]

3. Figure 3 shows two liquids A and B, and a solid C.

a) Using the diagram, record and write down the volume

of the two liquids A and B, in Table 1.

Table 1

[2]

b) Name the apparatus needed to find the mass of an object.__________________________ [1]

Mass (g) Volume (cm3) Density (g/cm3)

Liquid A 1.00

Liquid B 238.70 0.92

Solid C 2504.00 218.00

𝑥

1.0 m 0.5 m

10 N

500 N

𝐹

C

A B

Figure 3

Page 4 of 11 Physics – Year 9 – Track 3 – 2017

c) Mention ONE precaution that one must take when reading the volume of a

liquid from a thin measuring cylinder.

_______________________________________________________________

_____________________________________________________________[1]

d) Fill in the other missing parts of the table. Use the space below for your

working.

_______________________________________________________________

_____________________________________________________________[2]

e) The two liquids are poured in one cylinder. On the diagram of Figure 4, draw

and label liquid A and liquid B in their final settling positions. [1]

f) Solid C is dropped in the container with the two liquids. Mark the position that the solid will

settle in with a ‘C’. [1]

4. Table 2 contains information about some of the celestial bodies which orbit the Sun.

Table 2

Celestial Object

orbiting the Sun

Distance from the

Sun (× 𝟏𝟎𝟔 𝐤𝐦)

Time to spin once

on its axis (hours)

Time to complete orbit

around the Sun (years)

Mercury 58 1416.0 0.24

Venus 108 5832.0 0.60

Earth 150 24.0 1.00

Mars 228 24.5 1.90

Jupiter 779 10.0 11.90

Pluto 5906 153.3 248.00

a) Which of the celestial bodies in Table 2 has the shortest day and night?

___________________________________________________________________________[1]

b) Why do you think Mercury takes the shortest time to complete an orbit round the sun?

_____________________________________________________________________________

___________________________________________________________________________[1]

c) Which one of the celestial bodies in the table is NOT considered a planet? Explain.

_____________________________________________________________________________

___________________________________________________________________________ [2]

Figure 4

Physics – Year 9 – Track 3 – 2017 Page 5 of 11

d) Name the other THREE planets which are not in the table.

___________________________________________________________________________[3]

e) Explain the meaning of the term ‘light year’.

___________________________________________________________________________[1]

5. A luggage of mass 18 kg is being loaded by a conveyor belt as shown in Figure 5.

Figure 5

a) Calculate the gravitational potential energy of the luggage if it is raised through a height of

3 m.

___________________________________________________________________________[2]

b) Calculate the power needed to raise the luggage to a height of 3 m in 12 s.

_____________________________________________________________________________

___________________________________________________________________________[2]

c) The actual electrical power supplied is more than the answer obtained in part (b). Explain why

this is so.

_____________________________________________________________________________

_____________________________________________________________________________

___________________________________________________________________________[1]

d) The conveyor belt is removed. The luggage is accidentally dropped from Point B. Calculate

the velocity with which the luggage will hit the ground.

_____________________________________________________________________________

___________________________________________________________________________[3]

3 m

luggage

conveyor belt

B

A

Page 6 of 11 Physics – Year 9 – Track 3 – 2017

SECTION B

Each question carries 15 marks. This section carries 45 marks of the total marks for this paper.

6. Isaac and Rachela perform an experiment using a helical spring to verify Hooke’s Law.

a)

i) State Hooke’s Law.

__________________________________________________________________________

________________________________________________________________________[1]

ii) Draw a well labelled diagram of the apparatus they should use in this experiment.

[3]

b) Table 3 show the readings obtained during the experiment.

Table 3

Load/N 0 1 2 3 4 5 6 7 8

Length of Spring/mm 40 50 60 70 80 90 104 124 155

Extension/mm

i) What is the original length of the spring? ___________________________________ [1]

ii) Work out the extension to complete the table above. [1]

iii) Plot a graph of extension on the y-axis against load on the x-axis. [5]

iv) Mark the elastic limit with an ‘E’ on the graph. [1]

v) Explain what happens beyond the elastic limit.

__________________________________________________________________________

________________________________________________________________________[2]

vi) From your graph find the load needed to make the spring 75 mm long.

_______________________________________________________________________ [1]

Physics – Year 9 – Track 3 – 2017 Page 7 of 11

Page 8 of 11 Physics – Year 9 – Track 3 – 2017

7. Clive decides to go swimming to a beach close to his home.

a)

i) Calculate Clive’s weight if his mass is 72 kg.

__________________________________________________________________________

________________________________________________________________________[2]

ii) Clive has different types of sports shoes as shown in Table 4. Which of the following

should he choose in order NOT to sink in the sand? Explain your answer.

Table 4

A B C D

Shoe: _________ [1]

Reason: ___________________________________________________________________

________________________________________________________________________ [1]

iii) The base area of one foot is 180 cm2. The area in m2 is________________________ [1]

iv) Calculate the pressure produced by Clive when he stands on one foot.

__________________________________________________________________________

________________________________________________________________________ [2]

b) Clive arrives at the beach and dives into the sea which has a density of 1150 kg/m3.

Calculate:

i) the pressure due to the sea water only at a depth of 3 m;

__________________________________________________________________________

________________________________________________________________________ [2]

Physics – Year 9 – Track 3 – 2017 Page 9 of 11

ii) the total pressure at 3 m if the atmospheric pressure is 101 kPa;

__________________________________________________________________________

________________________________________________________________________ [2]

iii) While Clive is on the sea bed, he breathes out and releases bubbles of air. Explain why the

bubbles of air expand as they rise up to the surface.

__________________________________________________________________________

________________________________________________________________________ [2]

iv) Is it a good idea to go scuba diving and then catch an airplane after a few hours? Explain.

__________________________________________________________________________

________________________________________________________________________ [2]

8. James and Sarah swim in a swimming pool which is 15 m long, 10 m wide and 2 m deep.

a)

i) Find the volume of the water when the pool is full.

________________________________________________________________________ [2]

ii) If the density of the water is 1000 kg/m3, calculate the mass of the water in the pool.

__________________________________________________________________________

________________________________________________________________________ [2]

iii) They would like to heat the water from 14°C to 26°C. Calculate the amount of heat energy

it would require given that the specific heat capacity of water is 4200 J/ kg °C.

__________________________________________________________________________

__________________________________________________________________________

________________________________________________________________________ [2]

Page 10 of 11 Physics – Year 9 – Track 3 – 2017

b) James accidentally drops his swimming robe in the pool. He claims that a wet fleece robe or

a dry fleece robe will not make any difference in insulation. Sarah suggests that they do an

experiment to see whether this statement is correct. They use the following apparatus to test

James’ idea:

two identical jars;

kettle with water;

pieces of wet and dry fleece;

Figure 6

i) Mention TWO other pieces of apparatus that are needed to carry out this experiment.

________________________________________________________________________ [2]

ii) Describe how the experiment can be carried out.

__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________

________________________________________________________________________ [3]

Physics – Year 9 – Track 3 – 2017 Page 11 of 11

iii) James plotted graphs of temperature against time for both wet and dry fleece.

Figure 7

Was James correct to say that there would be no difference in lagging with wet or dry fleece?

Explain.

__________________________________________________________________________

__________________________________________________________________________

________________________________________________________________________ [2]

iv) Mention TWO ways in which Sarah and James could make sure that the test is fair.

__________________________________________________________________________

__________________________________________________________________________

__________________________________________________________________________

________________________________________________________________________ [2]

END OF PAPER