1. 1 Speed Learning Objective: To understand and use formulae involving speed. How many units of speed can you think of?

2. 2 How fast? Fastest Snail Max speed of a 747 Sound Light Cruising speed of Concorde

3. 3 How fast? Fastest Snail Max speed of a 747 Sound Light Cruising speed of Concorde 0.01 km/h 1.08 x 10 9 km/h 967 km/h 2150 km/h 1238 km/h

4. 4 Miles per hour (mph) Kilometres per hour (kph or km/h) Metres per second (m/s or ms -1 ) Speed =Distance Time Or S = D T S D T

5. 5 Speed =Distance Time S D T Time =Distance Speed Distance = Speed x Time

6. 6 A man is running at a speed of 8 km/h for a distance of 5200m. Find the time taken in minutes. S D T

7. 7 It has taken an aeroplane 6 hours to travel a journey at an average speed of 500 km/h. How far has it travelled? S D T

8. 8 What is 54 km/h in m/s ? 54 km/h= 54 000 metres / hour = 54 000 metres / minute 60 = 54 000 metres / second 60 x 60 = 15 m/s

9. 9 Page 50 Exercise 17