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# Speed and velocity

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### Speed and velocity

1. 1. Speed and velocity February 16, 2011 Copy and complete the following table: Quantity Symbol Unit Symbol Equation Speed         Distance         Time
2. 2. Quantity Symbol Unit Symbol Equation Speed v metre per second m/s v=d/t Distance d metre m d=vt Time t second s t=d/v
3. 4. Definition <ul><li>Speed is the rate of change of distance </li></ul>rate of changing
4. 6. speed distance time
5. 7. Why I don’t like formula triangles Now stick that in a triangle…
6. 8. Can you calculate speed? <ul><li>Usain Bolt can run 100 m in 9.58 second. How fast does he run? </li></ul>
7. 9. Worked example what you know what you want How they are related Rearrange and substitute Include units
8. 10. Two types of speed <ul><li>How fast was Usain Bolt running at the start? </li></ul><ul><li>How fast was he running in the middle? </li></ul><ul><li>How fast was he running at the finish? </li></ul>
9. 11. Average speed
10. 12. Instantaneous speed <ul><li>This is the speed at any given moment (or instant!) </li></ul><ul><li>A speedometer in a car gives the instantaneous speed but you would have to calculate the average speed (most GPS systems can do this for you) </li></ul>
11. 13. Displacement <ul><li>The difference between the starting point and finishing point. It is distance with direction </li></ul>
12. 14. How far does a football travel during a match? <ul><li>Distance: many kilometers </li></ul><ul><li>Displacement: 0 </li></ul>
13. 15. Velocity <ul><li>The rate of change of displacement </li></ul><ul><li>OR </li></ul><ul><li>How fast you are going in a particular direction </li></ul>
14. 16. Velocity
15. 17. velocity displacement time
16. 18. constant speed changing velocity
17. 19. Graphing movement February 16, 2011 Can you write a story describing the graph? Write down ALL the information this graph shows. Height / m time / s
18. 20. Learning objective <ul><li>Draw and interpret distance-time graphs </li></ul><ul><li>Draw and interpret velocity-time graphs </li></ul>
19. 21. Define these terms… <ul><li>Distance </li></ul><ul><li>Displacement </li></ul><ul><li>Speed </li></ul><ul><li>Velocity </li></ul>
20. 22. The Moving Man
21. 23. distance time
22. 24. distance time
23. 25. distance time
24. 26. distance time
25. 27. velocity time
26. 28. velocity time
27. 29. velocity time
28. 30. velocity time
29. 31. To do <ul><li>Using graph paper draw a distance-time graph of your journey to school </li></ul><ul><li>Now try a velocity-time graph of the same journey </li></ul>
30. 32. d / m t/mins
31. 33. v / ms-1 t/mins