Introducing my year 10 students to the formula triangle and how it works

1. Speed

2. Your mission is:
• Pair up – or jump in a 3, or do this individually – your choice (try
your best to pair up)
• You will have a timer between you to share.
• 1. One person will time, the other will walk/run 100m
• When finished, record the time you took to run/walk.
• 2. Swap – the timer will now run 100m, the runner will now time.
• Make sure to record the time it took you to run/walk 100m!
• We will come back up here and calculate our speed!

3. Speed can be measured in:
•Kilometres per hour (km/h)
•Metres per second (m/s)

4. The formula triangle!!

5. To find distance, we
remove it from the
triangle

6. To find time, we
remove it from the
triangle

7. To find speed, we
remove it from the
triangle

8. Question
•Daisha drove her
car 70km at an
average speed of
35km/h – How
long was the
journey?
Distance = 70km
Speed = 35 km/h
• Time = distance ÷ speed
• Time = 70 ÷ 35
• Time = 2
• We have used the unit
“kilometres per hour” so our
answer is 2 hours

9. Question
• John missed the
bus to had to walk
home from school.
It took him 2 hours.
His average speed
was 6km/h – how
far away from
school does John
live?
Speed = 6km/h
Time= 2 hours
• Distance = speed x time
• Distance = 6km/h x 2 hours
• Distance = 6 x 2
• = 12 kilometres

10. Question
•Kritesh ran 100m
in 9.58
seconds, what
was his average
speed?
Distance = 100m
Time= 9.58 seconds
• Speed = distance ÷ time
• Speed = 100 ÷ 9.58
• Speed = 10.43
• So Kritesh was travelling at
10.43 meters per second
(m/s)