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Science Quiz - Speed 03 (Questions)

Speed is a measure of how quickly something moves. In science, we use it to compare objects from sprinting athletes to spacecraft crossing huge distances.

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Fascinating Fact:

A rocket launched to the Moon took about 3 days to travel there, even though it was going thousands of miles per hour.

In KS3 Science, speed is studied as the relationship between distance and time. Understanding speed helps explain motion in everyday life, from vehicles to planetary travel.

Key Terms

Instantaneous speed: The speed of an object at a specific moment in time.
Velocity: Speed in a given direction, such as 60 mph north.
Deceleration: A decrease in speed, often caused by friction or braking.

Frequently Asked Questions (Click to see answers)

How is speed calculated in KS3 Science?

Speed is calculated using the formula speed = distance ÷ time. For example, if a car travels 100 km in 2 hours, its speed is 50 km/h.

Why is velocity different from speed?

Velocity includes both speed and direction. Two cars going 50 km/h in opposite directions have the same speed but different velocities.

What factors can affect the speed of a vehicle?

Factors include engine power, road conditions, wind resistance, and friction. Safety rules and speed limits also control how fast vehicles can travel.

Try These Related Quizzes

1.

If distance is measured in metres and speed in m/s, time is measured in .......

[ ]	seconds
[ ]	minutes
[ ]	hours
[ ]	None of these

2.

If distance is measured in kilometres and speed in km/h, time is measured in .......

[ ]	seconds
[ ]	minutes
[ ]	hours
[ ]	None of these

3.

If distance is measured in miles and speed in mph, time is measured in .......

[ ]	seconds
[ ]	minutes
[ ]	hours
[ ]	None of these

4.

How long would it take to run 400 m at a speed of 5 m/s?

[ ]	20 seconds
[ ]	80 seconds
[ ]	80 minutes
[ ]	8 hours

5.

How long would it take to run 800 m at a speed of 8 m/s?

[ ]	80 seconds
[ ]	100 seconds
[ ]	1 hour
[ ]	100 minutes

6.

How long would it take to travel 100 km at a speed of 50 km/h?

[ ]	2 hours
[ ]	60 minutes
[ ]	5,000 seconds
[ ]	5 hours

7.

How long would it take to travel 3 km at a speed of 15 m/s?

[ ]	5 seconds
[ ]	200 seconds
[ ]	45 minutes
[ ]	2 hours

8.

How long would it take to ride a motorbike 300,000 m at a speed of 60 km/h?

[ ]	0.5 hours
[ ]	5 hours
[ ]	5,000 minutes
[ ]	5,000 hours

9.

A car travels at 70 mph. How long will it take to travel 210 miles?

[ ]	20 minutes
[ ]	2.1 hours
[ ]	3 hours
[ ]	7 hours

10.

A cheetah runs at 100 km/h. How long will it take to run 100 metres?

[ ]	1 second
[ ]	0.001 hours
[ ]	1 minute
[ ]	1 hour

You can find more about this topic by visiting BBC Bitesize - Motion and speed

Science Quiz - Speed 03 (Answers)

1.

If distance is measured in metres and speed in m/s, time is measured in .......

[x]	seconds
[ ]	minutes
[ ]	hours
[ ]	None of these

Seconds are the basic SI unit of time and for calculations involving speed, you often need to convert hours into seconds to get the correct answer

2.

If distance is measured in kilometres and speed in km/h, time is measured in .......

[ ]	seconds
[ ]	minutes
[x]	hours
[ ]	None of these

In many situations, it is easier to understand speeds in terms of km/h rather than m/s

3.

If distance is measured in miles and speed in mph, time is measured in .......

[ ]	seconds
[ ]	minutes
[x]	hours
[ ]	None of these

When answering questions about speed, you need to pay close attention to the units and sometimes you will need to convert the units into something more suitable for carrying out the calculation

4.

How long would it take to run 400 m at a speed of 5 m/s?

[ ]	20 seconds
[x]	80 seconds
[ ]	80 minutes
[ ]	8 hours

Time = distance/speed so 400 m / 5 m/s = 80 s

5.

How long would it take to run 800 m at a speed of 8 m/s?

[ ]	80 seconds
[x]	100 seconds
[ ]	1 hour
[ ]	100 minutes

Time = distance/speed so 800 m / 8 m/s = 100 s

6.

How long would it take to travel 100 km at a speed of 50 km/h?

[x]	2 hours
[ ]	60 minutes
[ ]	5,000 seconds
[ ]	5 hours

Time = distance/speed so 100 km / 50 km/h = 2 hours

7.

How long would it take to travel 3 km at a speed of 15 m/s?

[ ]	5 seconds
[x]	200 seconds
[ ]	45 minutes
[ ]	2 hours

3 km = 3,000 m so time = 3,000 m / 15 m/s = 200 s

8.

How long would it take to ride a motorbike 300,000 m at a speed of 60 km/h?

[ ]	0.5 hours
[x]	5 hours
[ ]	5,000 minutes
[ ]	5,000 hours

300,000 m = 300 km so time = 300 km / 60 km/h = 5 hours. Light does it in 0.1 seconds!

9.

A car travels at 70 mph. How long will it take to travel 210 miles?

[ ]	20 minutes
[ ]	2.1 hours
[x]	3 hours
[ ]	7 hours

Time = 210 miles/70 mph = 3 hours

10.

A cheetah runs at 100 km/h. How long will it take to run 100 metres?

[ ]	1 second
[x]	0.001 hours
[ ]	1 minute
[ ]	1 hour

100 m = 0.1 km so time = 0.1/100 = 0.001 hours, 1 hour = 3,600 seconds so 0.001h = 3.6 seconds! The fastest humans take over 9 seconds to cover the same distance