fizik pksm 2

7/30/2019 fizik pksm 2

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1. Diagram 5.1 shows air was trapped in a beaker at the surface of water. The beaker is then

push into the water until it sinks at a depth, h, as shown in Diagram 5.2.

a) Name the type of pressure that acts on the surface of water.

(1 mark)

b) Based on the Diagram 5.1 and Diagram 5.2:

i) Compare the volume of air trapped in the beaker.

(1 mark)

ii) Give reason for your answer in 5(b)(i)

(1 mark)

c) i) Based on the answer in 5(b)(i) and 5(b)(ii), state the relation between the two

physical quantities involved.

(1 mark)

ii) Name the law involved in your answer in 5(c)(i)

(1 mark)


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d) When the pushing force that push the beaker in Diagram 5.2 is removed, the beaker

moved upward the water surface again.

Explain why the beaker moved upward the water surface.

(3 marks)

2. Diagram 2.1 shows a stone is weighed using a Newtons spring balance. Diagram 2.2 show

a same stone weighed in a water.

a) Name one physics principle involved when the load is fully immersed in the water.

(1 mark)

b) Explain why the reading of balance is less when the load is immersed in water.

(1 mark)


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c) Determine the volume of the load. The density of water is 1000 kg m

(2 marks)

d) Name one physics application in 2(a) in navigation.

(1 mark)

3. Diagram 2.1 shows Muthu applying a force f 20 N to push a stationary crate for 5 s. The

mass of the crate is 5 kg.

Diagram 2.1

a) What is the acceleration of the crate?

(1 mark)

b) Explain why the acceleration of the crate is constant from 0 s to 5 s.

(2 marks)


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c) Sketch a graph of velocity against time for the motion of the crate from 0 s to 5 s.

(2 marks)

4.

Diagram 6

Diagram 6 shows two wooden tops. One tops is partly coated with tin. Both tops are the

same size and are rotated with the same velocity. After a few minutes one of the tops stop

rotating.

a) What is meant by velocity?

(1 mark)

b) Explain why the top coated with tin take longer time to stop compared to the other top?

(1 mark)

c) Based on Diagram 3:

i) Compare the mass of two tops.

(1 mark)

ii) Compare the mass of two tops.

(1 mark)


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iii) Relate the mass of tops and the time of rotating for the tops.

(1 mark)

d) Based on the answer in (c) relate the mass of the tops to the inertia.

(1 mark)

e) Suggest two ways how to make the tops rotate for a longer period of time.

1.

2.

(2 marks)

5. Diagram 6.1 shows 500 ml of soup is boil in a metal pot and in a clay pot. Both pots

have the same mass, and received the same amount of heat .Diagram 6.2 shows the changes in temperature after 5 minutes.

(a) What is meant by temperature?

________________________________________________________________________(1 mark)


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(b) Observe Diagram 6.1 and Diagram 6.2,

State the difference between

(i) the rise in the soup temperature between the two pots.

_______________________________________________________________________(1 mark)

(ii) the rate of heat absorb by the two pots.

_______________________________________________________________________

_______________________________________________________________________

(1 mark)

(c) Give reason and explain your observation in 6(b)(i) and 6(b)(ii)

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

(2 marks)

(d) After the soup in the pots reaches the same temperature, both pots are moved away

from the burner as shown in Diagram 6.3.

Diagram 6.4 shows the changes in temperature 5 minutes after removing them from

the burner.


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Based on Diagram 6.3 and Diagram 6.4, compare the temperature of the

soup in the metal pot and the temperature of the soup in the clay pot 5 minutes

after removing them from the burner.

________________________________________________________________________

(1 mark)

(e) Based on your answers deduct a relevant physics concept and explain the relationbetween the changes in temperature and heat during the heating and cooling process.

________________________________________________________________________

(1 mark)

fizik pksm 2

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