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Science questions, unit 6
Nama / NameKelas / ClassTarikh / Date

Force

41 marks. Use Practice to check each answer as you go, or Exam to answer everything first. Ask a grown-up to help you mark the written answers.

Section A: objective questions

10 marks
Choose the best answer for each question.
1

Question 1

What is force?
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B
Force is a push or a pull that acts on an object.
For the teacher: Remembering, low difficulty, standard 6.1.1
Textbook p. 88
2

Question 2

Diagram 1 shows pupils working in a school library. Which activity is a pull?
Pupils opening and closing a door, pressing a clipboard, opening a laptop lid, pulling a zip and pressing keyboard keys
Diagram 1
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D
A pull moves an object closer to us. Opening a lid brings it towards us. The other three are pushes.
For the teacher: Understanding, low difficulty, standard 6.1.1
Textbook p. 88
3

Question 3

Diagram 2 shows a toothpaste tube being squeezed. What is the effect of the force?
A toothpaste tube being squeezed and clay being shaped
Diagram 2
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A
Squeezing changes the shape of the tube.
For the teacher: Understanding, low difficulty, standard 6.1.2
Textbook p. 90
4

Question 4

A cyclist pedals harder and the bicycle goes faster. Which effect of force is this?
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C
More force on the pedals increases the speed of the bicycle.
For the teacher: Applying, low difficulty, standard 6.1.2
Textbook p. 91
5

Question 5

A scooter slowly stops after Adam stops pushing it. In which direction does the frictional force act?
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B
Frictional force always acts in the opposite direction to the movement of the object.
For the teacher: Remembering, low difficulty, standard 6.2.1
Textbook p. 93
6

Question 6

Which is a disadvantage of frictional force?
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D
Friction wears out the soles. The other three are useful effects of friction.
For the teacher: Understanding, low difficulty, standard 6.2.2
Textbook p. 96
7

Question 7

The chain of Aiman's bicycle is tight and noisy. What should he do to reduce the frictional force?
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A
Lubricating oil makes the surfaces smoother so friction is smaller.
For the teacher: Applying, low difficulty, standard 6.2.4
Textbook p. 99
8

Question 8

A balloon becomes bigger when more air is blown into it. Why?
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C
More particles mean more collisions with the surface, so the air pressure inside rises and the balloon expands.
For the teacher: Understanding, medium difficulty, standard 6.3.1
Textbook p. 101
9

Question 9

An empty plastic bottle is closed tightly at the peak of a mountain. When it reaches the base, the bottle is crushed, as in Diagram 3. What does this show?
Closed bottle at the peak, going down, and crushed at the base
Diagram 3
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B
The higher air pressure outside at the base pushes the bottle inwards and crushes it.
For the teacher: Analysing, high difficulty, standard 6.3.2
Textbook p. 105
10

Question 10

A plunger is used to clear a blocked sink. Which statement explains how it works?
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D
Pressing the plunger down gives a lower pressure inside; pulling it up lets the higher pressure in the sinkhole push the clogged waste out.
For the teacher: Applying, medium difficulty, standard 6.3.3
Textbook p. 108

Section B: structured questions

31 marks
Answer all questions. Circle the answer or write it in the space.
11

Question 11

Aishah carries out some activities. Choose whether each one needs a push or a pull.
[1 mark] (a)Closing a door
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Push
[1 mark] (b)Pulling the zip of a pencil case
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Pull
[1 mark] (c)A bar magnet attracts paper clips without touching them. Name another force that also acts without contact.
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 6.1.1
Textbook p. 89
12

Question 12

Diagram 4 shows a footballer dribbling a ball and a shuttlecock being hit.
A badminton player hitting a shuttlecock and a footballer dribbling a ball
Diagram 4
[1 mark] (a)State the effect of the force on the ball when it is dribbled.
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Tick each point you got.
[1 mark] (b)A goalkeeper dives and catches a fast shot. State the effect of the force on the ball.
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Tick each point you got.
[1 mark] (c)A stationary trolley starts to move when a worker pulls it. State this effect of force.
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 6.1.2
Textbook p. 90
13

Question 13

Mei Ling adds 50 g weights to a thread until a book begins to move on a desk. She repeats it with a textbook on top of the book. Diagram 5 shows the weights she needed (practice numbers, not from the book).
Bar chart: book only 150 g, book with textbook 400 g
Diagram 5
[1 mark] (a)What is the manipulated variable?
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Tick each point you got.
[1 mark] (b)How much more weight was needed to move the books with the textbook?
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Tick each point you got.
[1 mark] (c)Give an inference for the answer in (b).
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Any 1 points
Tick each point you got.
[1 mark] (d)Predict the weight needed if Mei Ling puts a second textbook on top.
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Tick each point you got.
For the teacher: Analysing, medium difficulty, standard 6.2.3
Textbook p. 97
14

Question 14

A dry cell is rolled down a cardboard ramp onto different surfaces. The table shows how far it travels (practice numbers, not from the book).
SurfaceDistance (cm)
Paper85
Cloth50
Sandpaper20
Carpet35
[1 mark] (a)Which surface gives the largest frictional force?
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Sandpaper
The dry cell goes the shortest distance, so friction is largest.
[1 mark] (b)How much farther does the dry cell travel on paper than on carpet?
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Tick each point you got.
[1 mark] (c)State one variable that must be kept the same.
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[2 marks] (d)State the relationship between the type of surface and the frictional force.
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Tick each point you got.
For the teacher: Analysing, medium difficulty, standard 6.2.3
Textbook p. 98
15

Question 15

Diagram 6 shows three ways to deal with friction problems.
Oiling a bicycle chain, powder on a carrom board, a heavy box moved on a trolley with wheels
Diagram 6
[1 mark] (a)Why does the carrom board need talcum powder?
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Tick each point you got.
[1 mark] (b)How does a trolley make it easier to move a heavy box?
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Tick each point you got.
[1 mark] (c)Syafiq's hands slip when he holds a smooth racquet handle. Suggest how to stop this.
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Tick each point you got.
[1 mark] (d)Give one disadvantage of frictional force in a car engine.
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 6.2.4
Textbook p. 99
16

Question 16

Adam sips orange juice through a straw.
[1 mark] (a)When he sucks, what happens to the number of air particles inside the straw?
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Decreases
[1 mark] (b)Compare the air pressure inside the straw with the air pressure outside.
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Tick each point you got.
[2 marks] (c)Explain why the juice goes into his mouth.
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Tick each point you got.
For the teacher: Understanding, low difficulty, standard 6.3.1
Textbook p. 102
17

Question 17

Many climbers carry oxygen tanks when they climb Mount Everest. Diagram 7 shows how air particles change with height.
Mountain diagram with fewer air particles and lower air pressure at the peak
Diagram 7
[1 mark] (a)Why do climbers need oxygen tanks near the peak?
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Tick each point you got.
[1 mark] (b)How does the air pressure at the peak compare with the air pressure at sea level?
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Tick each point you got.
[1 mark] (c)State the relationship between the height above sea level and air pressure.
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Tick each point you got.
[2 marks] (d)A sealed packet of snacks is carried from the base to the peak. What happens to the packet? Explain.
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Tick each point you got.
For the teacher: Evaluating, high difficulty, standard 6.3.2
Textbook p. 105
18

Question 18

Diagram 8 shows a milk can with one hole. The milk will not flow out, but it flows when a second hole is made.
Milk will not flow from a can with one hole but flows with two holes
Diagram 8
[1 mark] (a)Why does the milk not flow out of the can with only one hole?
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Tick each point you got.
[1 mark] (b)Why does the milk flow when a second hole is made?
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Tick each point you got.
[1 mark] (c)Name one other tool that uses air pressure in daily life.
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Tick each point you got.
For the teacher: Applying, low difficulty, standard 6.3.3
Textbook p. 107