Speed: Science Darjah 6 practice questions with answers

Section A: objective questions

10 marks

Choose the best answer for each question.

Which of these is a unit of speed?

Kilogram (kg)
Kilometre per hour (km/h)
Centimetre (cm)
Minute (min)

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Speed is distance in a unit of time, so km/h is a unit of speed. The other three measure mass, length and time.

For the teacher: Remembering, low difficulty, standard 7.1.1

Textbook p. 115

What is speed?

The time taken by an object to stop
The distance between two places
How fast an object moves from one place to another
The weight of a moving object

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Speed measures how fast an object moves from one place to another.

For the teacher: Remembering, low difficulty, standard 7.1.1

Textbook p. 114

A bus travels 180 km in 3 hours. What is its speed?

60 km/h
90 km/h
177 km/h
540 km/h

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Speed = 180 km ÷ 3 h = 60 km/h.

For the teacher: Applying, low difficulty, standard 7.1.3

Textbook p. 120

A boy rides a bicycle at 8 m/s for 5 seconds. What distance does he travel?

13 m
1.6 m
3 m
40 m

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Distance = speed × time = 8 m/s × 5 s = 40 m.

For the teacher: Applying, low difficulty, standard 7.1.3

Textbook p. 120

A swimmer moves at 2 m/s. How long does he take to swim 50 m?

100 s
25 s
52 s
48 s

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Time = distance ÷ speed = 50 m ÷ 2 m/s = 25 s.

For the teacher: Applying, low difficulty, standard 7.1.3

Textbook p. 121

Diagram 1 shows two toy cars on the same track. The blue car takes 20 s to reach the finishing line, and the red car takes 17 s. Which statement is correct?

Two toy cars racing: blue takes 20 seconds, red takes 17 seconds; after 10 seconds red has gone 5 m and blue 4 m — Diagram 1

The red car is faster because it takes a shorter time.
The blue car is faster because it takes a longer time.
Both cars have the same speed.
The cars cannot be compared.

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For the same distance, the faster car takes the shorter time. The red car takes 17 s, so it is faster.

For the teacher: Understanding, low difficulty, standard 7.1.2

Textbook p. 116

A hoverboard moves at 5 m/s for 3 minutes. What distance does it cover?

15 m
300 m
900 m
1 800 m

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3 minutes = 180 s. Distance = 5 m/s × 180 s = 900 m.

For the teacher: Applying, medium difficulty, standard 7.1.5

Textbook p. 120

Four runners are timed. P: 120 m in 20 s. Q: 90 m in 10 s. R: 100 m in 25 s. S: 150 m in 30 s. Who is the fastest?

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Speeds: P = 6 m/s, Q = 9 m/s, R = 4 m/s, S = 5 m/s. Q has the greatest speed.

For the teacher: Analysing, medium difficulty, standard 7.1.3

Textbook p. 120

A lorry has a speed of 0 km/h. What does this tell us?

The lorry is stationary.
The lorry is moving slowly.
The lorry is moving very fast.
The lorry is going backwards.

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A speed of 0 km/h means the lorry covers no distance, so it does not move.

For the teacher: Understanding, medium difficulty, standard 7.1.1

Textbook p. 121

A car travels at 40 km/h. How many minutes does it take to travel 10 km?

4 minutes
25 minutes
15 minutes
30 minutes

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Time = 10 km ÷ 40 km/h = 0.25 h. 0.25 × 60 = 15 minutes.

For the teacher: Applying, high difficulty, standard 7.1.5

Textbook p. 121

Section B: structured questions

33 marks

Answer all questions. Circle the answer or write it in the space. Show your working for calculations.

Choose the most suitable unit of speed for each moving thing.

[1 mark] (a)A snail crawling on a leaf

cm/sm/skm/h

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cm/s

[1 mark] (b)An aeroplane flying to Kuching

cm/sm/skm/h

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km/h

An aeroplane travels hundreds of kilometres in an hour.

[1 mark] (c)Write the formula used to find speed.

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Speed = distance ÷ time1

Tick each point you got.

For the teacher: Remembering, low difficulty, standard 7.1.1

Textbook p. 115

Diagram 2 shows the distance travelled by four vehicles, R, S, T and U, in 120 minutes (practice numbers, not from the book).

Bar chart of distance in 120 minutes: R 60 km, S 120 km, T 90 km, U 30 km — Diagram 2

[2 marks] (a)Which vehicle is the fastest and which is the slowest?

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Fastest: S1
Slowest: U1

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[2 marks] (b)Calculate the speed of vehicle T in km/h.

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120 minutes = 2 hours [1]1
Speed = 90 km ÷ 2 h = 45 km/h [1]1

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[2 marks] (c)Vehicle S keeps the same speed. How far does it travel in 3 hours?

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Speed of S = 120 ÷ 2 = 60 km/h [1]1
Distance = 60 × 3 = 180 km [1]1

Tick each point you got.

For the teacher: Applying, low difficulty, standard 7.1.3

Textbook p. 125

Sani lets a toy car roll down a 1 m ramp. He changes the number of books under the ramp and records the time, as in Diagram 3.

Bar chart: 1 book 10 s, 2 books 8 s, 3 books 6 s, 4 books 4 s, 5 books 2 s — Diagram 3

[1 mark] (a)State the manipulated variable.

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Number of books (height of the ramp)1

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[1 mark] (b)State the responding variable.

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Time taken by the car to reach the end1

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[1 mark] (c)State one constant variable.

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Length of the ramp / same toy car / same surface1

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[2 marks] (d)State the relationship between the number of books and the time taken.

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The more books, the shorter the time [1]1
because the car moves faster [1]1

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[2 marks] (e)Calculate the fastest speed of the toy car in m/s.

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Shortest time = 2 s [1]1
Speed = 1 m ÷ 2 s = 0.5 m/s [1]1

Tick each point you got.

For the teacher: Analysing, low difficulty, standard 7.1.2

Textbook p. 126

Solve these problems. Show your working.

[2 marks] (a)A train travels 480 km in 4 hours. What is its speed?

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Speed = 480 km ÷ 4 h [1]1
= 120 km/h [1]1

Tick each point you got.

[2 marks] (b)A horse runs for 45 minutes at 40 km/h. What distance does it cover?

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45 min = 0.75 h [1]1
Distance = 40 × 0.75 = 30 km [1]1

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[3 marks] (c)A cyclist rides at 5 m/s. How many minutes does she take to ride 18 km?

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18 km = 18 000 m [1]1
Time = 18 000 ÷ 5 = 3 600 s [1]1
= 60 minutes [1]1

Tick each point you got.

For the teacher: Applying, medium difficulty, standard 7.1.5

Textbook p. 126

Diagram 4 shows a scooter ridden past positions A, B and C. It is 2 m from the start after 1 s, 4 m after 2 s and 6 m after 3 s.

An electric scooter at positions A, B and C after 1 s, 2 s and 3 s, having gone 2 m, 4 m and 6 m — Diagram 4

[1 mark] (a)Calculate the speed of the scooter at position C.

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6 m ÷ 3 s = 2 m/s1

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[1 mark] (b)Is the speed at position A the same as at position C?

YesNo

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Yes

At A: 2 m ÷ 1 s = 2 m/s. At C it is also 2 m/s.

[1 mark] (c)How far will the scooter go in 10 s at the same speed?

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2 m/s × 10 s = 20 m1

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[2 marks] (d)Zul says, "A vehicle that goes 6 m is always faster than a vehicle that goes 4 m." Is he correct? Explain.

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No [1]1
Speed depends on the time too: the 4 m vehicle could take a shorter time. We must compare the distance for the same time [1]1

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For the teacher: Evaluating, high difficulty, standard 7.1.3

Textbook p. 119

In the activity "My speed", a runner runs on the school field. Timekeepers at stations A, B, C and D record the time when the runner passes. The table shows the results (practice numbers, not from the book).

Table of station, distance and time: A 50 m 10 s, B 100 m 20 s, C 150 m 30 s, D 200 m 40 s — Diagram 5

[1 mark] (a)Calculate the speed of the runner at station B.

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100 m ÷ 20 s = 5 m/s1

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[2 marks] (b)Write an operational definition of speed in this activity.

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Speed is the distance in metres the runner covers in one second [1]1
found by dividing the distance by the time on the stopwatch at each station [1]1

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[2 marks] (c)The runner keeps the same pace for 400 m. Predict the speed and give a reason.

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5 m/s [1]1
The distance doubles and the time doubles to 80 s, so the speed stays the same [1]1

Tick each point you got.

For the teacher: Creating, medium difficulty, standard 7.1.4

Textbook p. 122

Section A: objective questions

Question 1

Question 2

Question 3

Question 4

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Section B: structured questions

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16