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Speed 02

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A peregrine falcon can fly at 90 km/h but can dive on its prey at much greater speeds.

Speed 02

Speed tells us how quickly something moves. Scientists use the formula speed = distance ÷ time, making it easy to compare cars, athletes, and even rockets.

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Fascinating Fact:

The fastest train in the world, a maglev in Japan, has reached over 370 miles per hour.

In KS3 Science, students investigate how speed is measured and applied. From sprinting to high-speed vehicles, speed links distance and time to explain how motion can be compared.

Key Terms

  • Speed: How fast something travels, worked out as distance divided by time.
  • Relative speed: The speed of one object compared to another, like two cars passing each other.
  • Uniform motion: Moving at a constant speed without speeding up or slowing down.

Frequently Asked Questions (Click to see answers)

How do you work out average speed in KS3 Science?

Average speed is found by dividing the total distance travelled by the total time taken, even if the speed changes during the journey.

What units are used for speed in science?

In science, speed is usually measured in metres per second (m/s). In everyday life, kilometres per hour (km/h) or miles per hour (mph) are common.

What is the difference between speed and acceleration?

Speed is how fast something moves. Acceleration is how quickly its speed changes, such as a car going from 0 to 60 mph in seconds.

Try These Related Quizzes

1 .
A car travels at 50 mph for 2 hours. How far does it go?
10 miles
50 miles
100 miles
100 kilometres
Distance = 50 mph x 2 h = 100 miles
2 .
If a peregrine falcon flies at 90 km/h, how far could it fly in 20 minutes?
4.5 kilometres
18 kilometres
30 kilometres
1,800 kilometres
20 minutes = 20/60 = 1/3 hour, so distance = 1/3 h x 90 km/h = 30 km
3 .
A cyclist has a speed of 10 km/h. She cycles for 2 hours - how far does she go?
5 kilometres
12 kilometres
20 kilometres
25 kilometres
Distance = 10 km/h x 2 h = 20 kilometres
4 .
If time is measured in hours, speed in mph, distance .......
is in centimetres
is in metres
is in kilometres
is in miles
Professional scientists would never use mph as a measure for speed in their experiments
5 .
If time is measured in hours, speed in km/h, distance .......
is in centimetres
is in metres
is in kilometres
is in miles
You don't always need to express distance in metres per second, in fact it can sometimes be more helpful to know speeds in more familiar everyday units like km/h
6 .
A car travels at 40 mph for 60 minutes. How far does it go?
40 kilometres
40 miles
60 miles
240 miles
60 minutes = 1 hour, so distance = 40 mph x 1 h = 40 miles
7 .
A cyclist has a speed of 10 km/h. She cycles for 120 minutes - how far does she go?
10 kilometres
12 kilometres
20 kilometres
1,200 kilometres
120 minutes = 2 hours, so distance = 10 km/h x 2 h = 20 km
8 .
An athlete runs at 8 m/s for 1 minute. How far do they go?
48m
80m
480m
4.8km
1 minute = 60 seconds, so distance = 8 m/s x 60 s = 480 m
9 .
A dog runs at 15 m/s for 30 seconds. How far does it travel?
45m
450m
2km
4.5km
15 m/s x 30 s = 450 m
10 .
If time is measured in seconds, speed in m/s, distance .......
is in centimetres
is in metres
is in kilometres
is in miles
This is the basic SI unit of distance
You can find more about this topic by visiting BBC Bitesize - Motion and speed

Author:  Sue Davison (Chemistry Specialist & KS3 Science Teacher, Quiz Writer)
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