f2 assessment
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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]