1. JABATAN PELAJARAN TERENGGANU
BIMBINGAN EMaS TAHUN 2007
PHYSICS
Module 5
Panels:
Ahmad bin Ismail
Noormi bin Ramli
Mohd Zamry bin Abdullah
Mamat bin Sulong
Zainal bin Yono
2. 1 Figure 1 shows a graph force against extension of a two different spring.
Figure 1
(a) What is meant by extension
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(b) Based on figure 2,
(i) show and label ,X, the elastic limit of the spring Q
(ii) calculate the spring constant Q
(iii) compare the spring constant of P and Q
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(c) Which spring is suitable to be used for absorber system of a car?
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3. 2 Figure 2 shows the arrangement of the apparatus which are used to measure the
atmospheric pressure.
vacuum
75 cm
mercury
20 cm
P
Figure 2
(a) Name the instrument which is used above.
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(b) Based on the figure above, what is the value of the atmospheric pressure
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(c) Calculate the pressure at P in Pascal.
(Density of mercury is 1.36 x 104 kgm-3)
(d) Why water is not a suitable liquid to replace mercury to measure the atmospheric
pressure?
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3 Figure 3.1 shows a boy jumping out from a boat to the jetty. Figure 3.2 shows a girl
throwing a ball from rest on a skateboard
Figure 3.1 Figure 3.2
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4. (a) Based on the pictures above,
(i) State the observation that shows the similarity between the two situations.
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(ii) In Figure 3.1 and Figure 3.2, draw the arrows of the moving directions F, of
the boat and the girl.
(iii) State the physics principle involves and explain it.
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(b) Figure 3.3 shows a fighter jet flying horizontally with a constant speed.
F2
F4 F3
F1
Figure 3.3
(i) Name forces F 1, F2, F3 and F4.
F1 : ………………………………………………………………………..
F2 : ……………………………………………………………………….
F3 : ……………………………………………………………………….
F4 : ………………………………………………………………………….
(ii) By comparing those forces, explain how the fighter jet could fly with the
constant speed.
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5. 4 Figure 4.1 and Figure 4.2 show two ways in which a gardener moves a
wheelbarrow on a muddy road.
Figure4.1 Figure 4.2
(a) On Figure 4.1 and Figure 4.2 ,indicate and label:
(i) the direction of force F exerted by the gardener on the handle of each
wheelbarrow to make it move.
(ii) the direction of the vertical component Fy , of the force in (a)(i)
(b) (i) Based on the answers in (a)(i) and (a)(ii), which of the ways is more suitable
on the muddy road?
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(ii) Explain the reason for your answer in (b)(i).
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(c) The wheel of the wheelbarrow exerted pressure on the muddy road . The resultant
force exerted by the wheel on the road surface is 500 N and the area of the wheel
-3 2
in contact with the road is 2 x 10 m .
(i) What does the word pressure mean?
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(ii) Calculate the pressure exerted on the surface of the muddy road.
(ii) State one modification that could be made to the wheelbarrow to reduce the
pressure exerted on the road. Explain your answer.
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6. 5 (a) A submarine can sail on the sea surface and under the sea . It also can detect
any war ship and human on the island.
Explain how you would design a submarine so that it can :
(i) float and submerge
(ii) occupy the soldiers safely
(iii) detect war ship
(iv) move with high speed
(b) Figure 5 shows a food container used for keeping the food warm. The container
is able to maintain the temperature of food for a long time. The container is fixed
and cannot be moved
Figure 5
The following table shows the characteristics of materials which could be used to make
the food container.
Charateristic Density/kg m-3 Melting Specific Thermal
point / o C Heat capacity/ conductivity
J kg-1 oC-1
Material
2 710
P 660 910 High
910
Q 27 600 Low
700
R 1 050 240 Low
1 670
S 2 600 1 200 Low
800
T 3 800 2 020 High
You are asked to investigate the characteristics of the materials in the table which
could be used to make the food container as in the figure above.
Explain the suitability of each characteristics in the table and hence, determine
which material is most suitable to be used to make the food container.
Justify your choice
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7. 6 A student carried out an experiment to investigate the relationship between the pressure
, P ,and volume , V , of a fixed mass of gas at constant temperature.The results of the
experiment is shown in a graph of 1/v against P shown in Figure 6
Figure 6
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8. Based on the the graph
(a) State the relationship between P and V
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(b) The relationship between P and V is given by the equation;
P V= k
where k is the gas constant.
(i) Calculate the gradient , m , of the graph 1/v against P .
Show on the graph how you determine the gradient.
(ii) By using the value of gradient, determine the value of the gas constant , k.
(iii) By using the value of k, determine the value of V when P = 20.0 N cm-2
(c) Determine the value of V, when the pressure P = 12 N cm -2.
Show on the graph how you determine the value of V
(d) State one precaution to ensure that the gas mass is kept constant.
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