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SEKOLAH SRI UTAMAKUALA LUMPUR

PENILAIAN AKHIR TAHUN 2015SCIENCEFORM 2

Answer all questions.[40 marks]

1. (a) Name the forces shown in Diagram 1.1.

[4 marks]

(i) ………………………………….. (ii) …………………………………..

(iii) ………………………………….. (iv) …………………………………..

Diagram 1.1

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(b) Diagram 1.2 shows a girl playing hockey.

State two effects of force on the ball when the girl hits the ball with a hockey stick.

(i) ………………………………………………………………………………………………….

(ii) ………………………………………………………………………………………………….

[2 marks]

Diagram 1.2

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2. A worker pushes a sack of rice using a trolley to the shop as shown in Diagram 2.1.

(a) If the frictional force between the trolley and the ground is 500 N, calculate the work done by the worker.

[2 marks]

(b) A boy tries to push the sack of rice but the sack is too heavy for him to move.

(i) Did the small boy do any work?

……………………………………………………………………………………….

[1 mark]

(ii) Why?

……………………………………………………………………………………….

[1 mark]

Diagram 2.1

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(c) The worker carries a sack of rice weighing 50 kg upstairs. If the mass of the man is 65 kg, calculate the work done in Diagram2.2.

(1 kg = 10 N)

[2 marks]

(d) The worker takes 5 minutes to complete the work in (c). Calculate his power.

.

[2 marks]

Diagram 2.2

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3. Diagram 3.1 shows a wooden block being pulled on a table top.

(a) Name the forces acting on the wooden block.

(i) …………………………………………………………………………………………

(ii) …………………………………………………………………………………………

[2 marks]

(b) Using , draw the direction of the frictional force acting on the wooden block in the box provided in Diagram 3.1.

[1 mark]

(c) What will happen to the reading of the spring balance if the same wooden block is pulled along a piece of sand paper?

……………………………………………………………………………………………

[1 mark]

Wooden block

Smooth table top

Spring balance

Diagram 3.1

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(d) Diagram 3.2 shows a man pushing a box towards the wall.

(i) Suggest one way on how he can reduce the force needed to push the box.

………………………………………………………………………………………..

[1 mark]

(ii) If the force needed to push the box is 300 N. Calculate the work done by the man in pushing the box towards the wall.

[2 marks]

Wall

Box

5 m

Diagram 3.2

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4. Diagram 4.1 shows some methods used to reduce friction.

(a) Name method P, Q, and R on Diagram 4.1. [3 marks]

(b) Diagram 4.2 shows some used tyres.

(i) What has happened to the surfaces of the tyres?

…………………………………………………………………………………………….

[1 mark](ii) Explain your answer in (b)(i).

………………………………………………………………………………………….

………………………………………………………………………………………….

P: ……………………….. Q: ……………………….. R: ………………………..

Diagram 4.1

Diagram 4.2

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[1 mark](c) Diagram 4.3 shows two persons walking.

(i) State one advantage of friction in this situation.

…………………………………………………………………………………………

[1 mark]

(ii) State one disadvantage of friction in this situation.

…………………………………………………………………………………………

[1 mark]

Diagram 4.3

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5. Diagram 5.1 (a) shows a boy using a straw to drink from a packet drink. Diagram 5.1 (b) shows the condition of the box after he finished drinking

.

(a) What causes the box to collapse as shown in Diagram 5.1(a)?

………………………………………………………………………………………………

[1 mark]

(b) (i) What should the boy do to regain the shape of the box?

….………………………………………………………………………………………

[1 mark]

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

…………………………………………………………………………………………

…………………………………………………………………………………………

[2 marks]

Diagram 5.1(a) Diagram 5.1(b)

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(c) Diagram 5.2 shows how medicine is being drawn into a syringe.

(i) What can be observed when the piston is pulled upwards? …………………………………………………………………………………………

[1 mark]

(ii) What happens to the volume of air in the syringe when the piston is pulled upwards?

…………………………………………………………………………………………….

[1 mark]

(iii) How does this affect the air pressure in the syringe?

…………………………………………………………………………………………….

[1 mark]

(iv) What pushes the medicine into the syringe?

…………………………………………………………………………………………….

[1 mark]

Diagram 5.2

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6. Diagram 6 shows a suction pump.

(a) What is the function of a suction pump?

…………………………………………………………………………………………….

[1 mark]

(b) What happens when the suction pump is pushed onto the surface of sink as shown in Diagram 2?

……………………………………………………………………………………………….

[1 mark]

(c) What makes the suction pump to be attached firmly onto the surface of the sink?

………………………………………………………………………………………………

………………………………………………………………………………………………

[1 mark]

(d) What happens to the pressure in X and Y when the pump is pulled upwards again?

…………………………………………………………………………………………….

…………………………………………………………………………………………….

Diagram 6

X

Y

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[1 mark]