1. Speed
• Speed is a measure of the distance an object
moves in a given amount of time.
• During a typical trip to school, your car will
undergo a series of changes in its speed.

2. Speed
How could we How fast do
you think I
measure the speed of am going?
an object?
What do we need to
know?

3. Speed
Speed = distance travelled
time taken

4. Speed metres
Speed = distance travelled
time taken
Metres per second
(m/s)
seconds

5. Speed kilometres
Speed = distance travelled
time taken
Kilometres per hour
(km/h)
hours

6. STARTER ACTIVITY:
Distance, Speed and D
Time
Speed = distance (in metres)
time (in seconds)
S T
1. Laura covers 2000m in 1,000 seconds. What is her speed?
S = D/T
= 2000m/1000s
= 2 m/s
2. How long would it take to run 100 metres if you run at 10m/s?
T = D/S
= 100m/10m/s
= 10s
3. Steve travels at 50m/s for 20s. D=SxT
= 50m/s x 20s
How far does he go? = 1000m

7. Distance travelled?
What if we know the speed of an object
and the time it moved for and need to
calculate the distance travelled?

8. Distance travelled?
What if we know the speed of an object
and the time it moved for and need to
calculate the distance travelled?
Speed = distance
time
distance = speed x time

9. Time?
What if we know the speed and the
distance travelled, how do we calculate
how long (time) the journey took?

10. Time?
What if we know the speed and the
distance travelled, how do we calculate
how long (time) the journey took?
Speed = distance
time
time = distance
speed

11. triangle
d
s x t

12. Don’t forget!
If the distance is measured in metres
and the time in seconds,
-the speed will be in metres per
second (m/s or m.s-1).
If the distance is in kilometres and the
time in hours,
-the speed will be in kilometres per
hour (km/h or km.h-1) etc.

13. EXAMPLES

14. Usian Bolt ran 100m
in 9.58 seconds, what
was his average
speed?
10.43 m/s

15. Another example
A dog runs at a speed
of 5 m/s for one
minute. How far does
he run?

16. Another example
A dog runs at a speed
of 5 m/s for one
minute. How far does
he run?
Distance = speed x time
= 5 x 60 = 300 m

17. Another example!
A car travels at 30 km/h
and covers a distance
of 900 km. How long
did it take?

18. Another example!
A car travels at 30 km/h
and covers a distance
of 900 km. How long
did it take?
Time = distance/speed
= 900/30 = 30 hours

19. Now you try!
• Extension:
• How long does it take you
to hop 5m?
• Can you use a metre stick
and stopwatch to help
calculate your average
hopping speed?
• Also try:
-walking backwards
-hopping backwards