1. Speed and average speed
In this section you will:-
be able to work out the average speed
of a journey
be able to recognise different speeds
by looking at distance-time graphs.

2. . __ Speed = distance time
To work out the speed something is travelling with
We need to measure 2 things:
the distance the object has travelled
the time it takes for the journey __ .
Speed = distance time
(in metres per
second or m/s)
(in metres) (in seconds)

3. . . . __ Speed = distance time Average = total distance total time
(in metres per
second or m/s)
(in metres) (in seconds) .
Average = total distance total time
Speed travelled taken .

4. . . Bald Bob goes on a journey Stage 1 = 5m in ___s2
Bald Bob goes on a journey
Stage 1
5metres 2 0m
Stage 3
31metres
Average speed = total distance/total time taken
Use this equation to work out the average speed of Bobs journey . .
Average speed =
Answer =

5. Bald Bob goes on a journey
Stage 1 = 5m in ___s
Stage 2 = 0m in ___s
Stage 3 = 31m in ___s 5
Speed is _____m/s 1
slowest 5
15.5
fastest 2
Bald Bob goes on a journey
Stage 1
5metres 2 0m
Stage 3
31metres
Average speed = total distance/total time taken 36
/12
=3m/s

6. The steeper the graph the faster the object
distance
distance
distance
Stationary
(stopped)
fast
slow
time
time
time
Slow car
Fast car
Stopped car
The steeper the graph the faster the object
is moving. A horizontal line is a stationary
object

7. Work out the average speeds of the following 4 journeys

8. . . Bald Bob Average speed = Answer = Distance/m 300 fastest slowest12
Time/s

9. . . Mum Average speed = Distance/m Answer = 20 15 10 fastest 5 slowest
fastest
slowest
Time/s

10. . . . . . . Snooty Sarah Answer = Distance /m Answer = 30 slowest 20
Fastest speed =
Answer = . .
Distance /m
speed in the final stage=
Answer = 30
slowest 20
fastest . 10 . 40 60
Time/s
Average speed =
Answer =

11. . . Dippy Daisy Average speed = Answer = Distance/m 30 slowest fastest20
Time/s

12. Answers:-
Bald Bob / = 25m/s
Mum / = 0.4m/s
Snooty Sarah fastest =20/10 = 2m/s
final stage = 10/20 = 0.5m/s
average speed = 30/60=0.5m/s
Dippy Daisy average speed = 60/20 = 3m/s

13. Speed is worked out by dividing the distance by the
An object travels 15metres in 5seconds so it’s speed will be
The average speed is worked out by dividing the total distance by the
The average speed of an object going 10m in 6s and 20m in 4s is
An object that is not moving will produce a distance-time graph that is
Objects moving with a steady fast speed will make a line that is
Objects moving with a steady slow speed will make a line that is
The distance an object travels is measured in
The time an object takes to travel is measured in
The speed of an object is measured in
A steep line would be made by an object moving
A flat line would be made by a person who is
A line with a small slope would be made by an object moving
An object which speeds up is said to be
An object which slows down is said to be

14. Time
3m/s
Total time
30/10=3m/s
Horizontal
Steep
Shallow(not very steep)
Metres or kilometres
Seconds or hours
km/h or m/s
Quickly
Stationary
Slowly
Accelerating
decelerating
Speed is worked out by dividing the distance by the
An object travels 15metres in 5seconds so it’s speed will be
The average speed is worked out by dividing the total distance by the
The average speed of an object going 10m in 6s and 20m in 4s is
An object that is not moving will produce a distance-time graph that is
Objects moving with a steady fast speed will make a line that is
Objects moving with a steady slow speed will make a line that is
The distance an object travels is measured in
The time an object takes to travel is measured in
The speed of an object is measured in
A steep line would be made by an object moving
A flat line would be made by a person
A line with a small slope would be made by an object moving
An object which speeds up is said to be
An object which slows down is said to be

15. END