New
New
Year 8

Calculating speed

I can calculate speed.

New
New
Year 8

Calculating speed

I can calculate speed.

Lesson details

Key learning points

  1. The greater the speed of an object, the shorter the time it takes to cover a certain distance.
  2. The greater the speed of an object, the more distance it travels in a certain time.
  3. Speed = distance / time.
  4. Speed is measured in m/s or km/h or miles/h.
  5. m/s is the number of metres travelled each second.

Common misconception

"Constant speed" can be interpreted as "moving all the time", and "steady speed" as "not too fast".

Use the terms with care, qualifying them with examples when they are used, e.g. "a constant speed of 4 m/s" or "a steady speed of 100 m/s".

Keywords

  • Distance - a length between two points, usually measured in metres (m).

  • Time - a duration, usually measured in seconds (s).

  • Speed - the distance it travels each second.

  • Metres per second (m/s) - the standard unit used to measure speed.

  • Miles per hour (mph) - the unit often used to measure vehicles’ speeds.

Students can find it easier to understand speed calculations building from the relationship distance = speed × time, rather than speed = distance ÷ time, this is the approach used in this lesson.
Teacher tip

Content guidance

  • Risk assessment required - equipment

Supervision

Adult supervision required

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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6 Questions

Q1.
Which of these are units of distance?
Correct answer: miles
Correct answer: metres (m)
Correct answer: centimetres (cm)
kilograms (kg)
Correct answer: kilometres (km)
Q2.
Which word is used to describe how fast or slow an object is moving?
force
acceleration
direction
Correct answer: speed
momentum
Q3.
Starting with the shortest, put the values in order of length.
1 - 30 mm
2 - 15 cm
3 - 1 m
4 - 150 cm
5 - 12 m
6 - 0.5 km
7 - 1 km
Q4.
Which two pieces of information could you use to work out the speed of a motorcycle after it has finished a journey?
The weight of the motorcycle.
Correct answer: The distance the motorcycle has travelled.
The amount of petrol in the motorcycle.
Correct answer: The time the motorcycle was travelling for.
The direction the motorcycle travelled.
Q5.
Match the description of movement to the distance travelled in a certain time.
Correct Answer:A snail crawling,2 metres each hour

2 metres each hour

Correct Answer:A person walking,1 metre each second

1 metre each second

Correct Answer:A fast sprinter,9 metres each second

9 metres each second

Correct Answer:A lorry on a motorway,60 miles each hour

60 miles each hour

Correct Answer:A jet plane,900 kilometres each hour

900 kilometres each hour

Q6.
A red car and a blue car start at the same time and travel the same distance along a track. The red car takes 20 s to reach the end and the blue car takes 25 s. Which of the statements are correct?
The cars are travelling at the same speed.
Correct answer: The red car is faster than the blue car.
The blue car is faster than the red car.
Correct answer: After 1 s the red car has travelled further than the blue car.
After 1 s the blue car has travelled further than the red car.

6 Questions

Q1.
Two cars travel along a track for the same amount of time. The green car travels twice as far as the red car. Which of these statements is true?
An image in a quiz
The green car started moving before the red car did.
The red car stopped moving before the green car did.
The average speed of the red car is greater than the average speed of the green.
Correct answer: The average speed of the green car is greater than the average speed of the red.
The average speed of the two cars is the same.
Q2.
Which of these equations involving speed, distance and time is correct?
distance travelled = speed + time
distance travelled = speed - time
Correct answer: distance travelled = speed × time
distance travelled = speed ÷ time
Q3.
A cyclist travels at an average speed of 15 m/s for 45 seconds. Calculate the distance they travel.
An image in a quiz
0.3 m
3.0 m
30 m
60 m
Correct answer: 675 m
Q4.
A speedboat travels 70 miles in 3.5 hours. Calculate the speed of the boat.
An image in a quiz
Correct answer: 20 miles/h
30 miles/h
35 miles/h
245 miles/h
Q5.
The table shows the speeds of athletes in races of different lengths. Starting with the longest time, put the athletes into order of how long it took them to finish their race.
An image in a quiz
1 - Athlete D
2 - Athlete B
3 - Athlete C
4 - Athlete A
5 - Athlete E
Q6.
An aeroplane travels a distance of 1080 km in 3 hours. Calculate the speed of the aeroplane in m/s.
An image in a quiz
36 m/s
Correct answer: 100 m/s
360 m/s
3240 m/s
6000 m/s
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