30

35 0 mm

SECTION A (20 MARKS)

Answer all the questions. For each question, there are four possible answers A, B, C and D. Choose the one you consider correct and record it on the separate Answer Sheet.

1. A block of wood rests on a ruler.

What is the length of the block of wood?

A 3.5 cmB 4.0 cmC 4.5 cmD 8.0 cm

2. Which of the following quantities is not a vector quantity?

A displacementB accelerationC forceD temperature

3. The diagram shows a micrometer screw gauge.

What is the reading shown?

A 2.32 mmB 2.82 mmC 3.32 mmD 5.32 mm

2

block of wood

cm5 6

0 105

4. Yan received a new 10-cent coin which was issued to mark Singapore’s progress as a nation. She uses a pair of vernier calipers to measure the diameter of the coin.

What is the reading of the vernier calipers?

A 5.35 cmB 5.37 cmC 5.45 cmD 5.47 cm

5. A pendulum swings from X to Y and back again as shown in the diagram below.

Which of the following will cause the period of oscillation to increase?

A increasing the amplitude of oscillationB increasing the length of the pendulumC increasing the mass of the pendulumD pushing the pendulum with a horizontal force

3

speed

A

B

C

D

6. Danish is standing on the platform of a train station, watching the trains passing the station.

A train travelling at 30 ms-1 takes 3 s to pass him. What is the length of the train?

A 10 mB 30 mC 90 mD 300 m

7. The graph shows how the speed of an object changes with time. Which section of the graph shows the object moving with a decreasing acceleration?

8. A durian falls from a tree. Neglecting air resistance, which of the following statements is correct?

A It free falls at a constant velocity of 10 ms-1.B It free falls at a constant acceleration of 10 ms-2.C It free falls at a constant deceleration of 10 ms-2.D It free falls at zero acceleration

4

time

300 N

0.4 m

0.1 m

0.5 m

Fig. 11.2

0.5 m1.0 m

0.4 m

0.1 m

Fig. 11.1

9. Which wooden block will remain at rest under the action of the forces shown?

A B C D

10. The diagram shows a number of forces acting on an object. The object does not move.

Which of the following statements is correct?

A All the forces acting on the object are too small.B All the forces acting on the object are too large.C All the forces acting on the object are the same size.D The resultant force acting on the object is zero.

11. Figure 11.1 shows a wooden plank of mass 22.4 g and with dimensions of 1.0 m by 0.4 m by 0.1 m. The plank is sawed into two equal halves, as shown in Figure 11.2.

What is the density of one of the halves of the wooden planks in Figure 11.2?

A 0.14 kgm-3

B 0.28 kgm-3

C 0.56 kgm-3

D 1.12 kgm-3

12. Which one of the following objects has the greatest inertia?5

Liquid A

Liquid B

Solid C

P Q

R

A a stationary ball of mass 200 gB a stationary vehicle of mass 3000 kgC a trolley of mass 2 kg moving at 2.0 ms-1.D an athlete running the 100 m race in 10 s

13. Liquid A, Liquid B and Solid C were mixed together as shown in the diagram of a cylinder below.

What can be said about the densities of the three materials?

A All of them have the same density.B Liquid A has the highest density.C Solid C has a higher density than Liquid A, but a lower density than Liquid B.D Solid C has a lower density than Liquid A, but a higher density than Liquid B.

14. The diagram shows three identical balls in different situations. If they are being released at the same time, what is the stability of each ball?

P Q R

A unstable stable neutral

B neutral unstable stable

C stable neutral unstable

D neutral stable unstable

6

A B

CD

15. The diagram shows a plane laminar with uniform mass hanging at the pivot marked with X and it is at its rest position.

Which point is the centre of gravity?

16. A substance has a definite volume but no definite shape. Which of the following best describes the substance?

A The substance is a solid.B The substance is a liquid.C The substance is a gas.D The substance is either a liquid or a gas.

17. Some water molecules are found to escape from the surface of a lake. What is the name of this process?

A freezingB boilingC meltingD evaporation

18. Which one of the following occurs when a substance solidifies?

A It loses thermal energy.B It absorbs thermal energy.C Its temperature increases. D Its temperature decreases.

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19. As the temperature of a material increases, the average _______ of its particles increases.

A kinetic energyB potential energyC inertiaD mass

20. The graph shows the variation of temperature against time when a solid is heated until it turns into a gas.

Which of the following parts of the heating curve contains the liquid state only?

A ABB BCC CDD DE

8

SECTION B (25 MARKS)

Answer all the questions. Write your answers in the spaces provided and show your working clearly.

1. The following table gives some information on measurements and units. Complete the table by filling in the blank spaces.

[3]

Unit symbol multiple

Metre m 1

Micrometer

Centimeter

mm 1x 10-3

Kilometer 1 x 103

2. A simple pendulum is shown in the diagram.

a. Define the period for a pendulum. [1]

b. If the length of the pendulum were made longer, what will be the effect on the period of the pendulum?

[1]

c. If another larger mass were used as a new pendulum bob, what will be the effect on the period of the pendulum?

[1]

9

d. A student conducted an experiment using the simple pendulum. The time for 5 oscillations was measured as 14.51 s during the first attempt. In the second attempt, the time taken for 5 oscillations is measured as 15.16 s.

i. Find the average time for both attempts.[1]

ii. Hence, using your answer from part (a), calculate the period for the pendulum.

[1]

3. An alloy is made up of a mixture of two or more metals. Brass alloy is made by melting 20 cm3 of zinc with density 2.50 g/cm3 and 25 cm3 of copper with density 8.40 g/cm3. Assuming there is no change in volume as the alloy is formed, calculate the following:

a. the mass of the alloy,[2]

b. the volume of the alloy,[1]

c. the overall density of the alloy.[2]

10

4. The tank shown in the figure below has a mass of 2 500 kg. The area of the caterpillar tracks in contact with the ground is 20 m2.

a. Calculate the weight of the tank.[1]

b. Calculate the pressure exerted by the tracks on the ground.[1]

c. Explain why the tank is always fitted with a large caterpillar track as shown in the figure below.

[2]

11

5. Using the Kinetic Theory of Matter, explain the following statements:

a. Two identical suction pumps were each filled with air and water respectively. The piston was pushed inwards with the same amount of force. It was observed that the suction pump which has been filled with air can be easily compressed. It was almost impossible to compress the other suction pump that has been filled with water.

[1]

b. 1 m3 of substance A in the solid state has a larger mass than 1 m3 of the same substance in the gaseous state.

[1]

c. Liquid drinks will always take the shape of the container as shown in the figure below.

[1]

12

Piston is pushed inwards

25

0

30

10 25 40Time/ min

Temperature/ 0 C

45

6. A solid substance was removed from the refrigerator at 0 ºC and placed in a room. The figure shows how the temperature of the substance varied over 45 minutes.

a. The substance is observed to exist in different states at different periods of time. Complete the table provided below.

[2]

Section State of substanceA

B

C

D

b. What is the melting point of the substance? [1]

c. Thermal energy is constantly provided to the substance. However, this thermal energy is used for different purposes at different sections of the graph. Complete the table below.

[2]

Section Purpose of the thermal energy

B

C

13

A

B C

D

speed/ ms-1

10

20

30

15.0

time / s

0 5.0 10.0 20.0 25.0 30.0

SECTION C (20 MARKS)

Answer any two questions from this section in the spaces provided.

1. A student investigated the motion of a car at different times during part of a journey. She measured the speed of the car every 5.0 s. The table below shows her results.

time / s speed / ms-1

0 0

5.0 10

10.0 20

15.0 30

20.0 30

25.0 15

30.0 0

a. Plot a graph of speed against time on the axes below.[2]

b. Describe the motion of the car in the first 20 s.[2]

14

c. Calculate the gradient from 0 s to 15 s. What does the gradient represent?[2]

gradient reprersents

d. Using your graph, calculate the distance travelled in the 30 s.[2]

e. Calculate the gradient from time 20 s to 30 s. What does this represent?[2]

gradient reprersents

15

Sea

Spring

Plank

Pivot

A B C

3.5 m1.0 m

2. The figure below shows a diving board. The uniform plank of total length, 5 m, has a spring attached at A. It is pivoted at B as shown. The weight of the plank can be considered as negligible.

a. A diver of mass 75 kg stands at C. What is the weight of the diver?[2]

b. Calculate the moment created by the diver at C upon the pivot. What is the direction associated with this moment?

[3]

Direction of Moment:

c. State the Principle of Moments.[1]

16

d. What should be the value for the anti-clockwise moment exerted by the spring?

[1]

e. Calculate the force in the spring.

[2]

f. What would be the effect on the force in the spring if the distance of AB is reduced to 0.5 m?

[1]

a.

17

3. The figure below shows a 25 kg box being pushed with a constant horizontal force of 80 N along a horizontal rough floor at a constant speed of 0.1 ms-1.

a. What do you understand by the term “friction”? [1]

b. If the box is moving with a constant speed of 0.1 ms-1 along the rough floor, what is the acceleration experienced by the box?

[1]

c. State the magnitude and the direction of the fricitional force.

[2]

Magnitude of frictional force

Direction of frictional force

d. The box is now moved into the polished part of the floor. Describe how the new frictional force between the box and the polished floor would be different from the original frictional force between the box and the rough floor.

[1]

e. It was found that the box experienced an acceleration of 2 ms-2 when it is being pushed along the polished floor. Calculate the resultant force acting on the box.

[2]

18

Rough floor Polished floor

80 N

f. Using your answer from (e), determine the friction between the box and the polished floor.

[1]

g. Suggest two ways to reduce the friction between the box and the polished floor.

[2]

END OF PAPER

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