1. Motion Graphs

2. Units What are the units of speed when:
Distance is measured in metres and time in seconds
Distance is measured in kilometres and time in hours
Distance is measured in metres and time in minutes

3. Calculate
Pairs of cameras spot your number plate, start a timer, and then spot your number plate again leaving a zone
800 m
The speed cameras record that a car takes 350 seconds to move between them. Calculate the average speed of the car. Show your working. Give the unit.
2.28 m/s

4. Distance against time graphs

5. No movement?
distance
time

6. No movement
distance
time

7. Constant speed?
distance
time

8. Constant speed
distance
time

9. Constant speed distance The gradient of this graph gives the speed
time

10. How would the graph look different for a faster constant speed?
distance
time

11. Constant speed
fast
distance
time

12. How would the graph look different for a slower constant speed?
fast
How would the graph look different for a slower constant speed?
distance
time

13. Constant speed
fast
distance
slow
time

14. Getting faster? (accelerating)
distance
time

15. Getting faster
distance
time

16. Examples
distance
time

17. A car accelerating from stop and then hitting a wall
distance
time

18. A car accelerating from stop and then hitting a wall
distance
time

19. Speed against time graphs

20. No movement?
speed
time

21. No movement
speed
time

22. Constant speed?
speed
time

23. Constant speed
speed
time

24. How would the graph look different for a faster constant speed?
time

25. Constant speed
speed
fast
time

26. How would the graph look different for a slower constant speed?
fast
time

27. Constant speed
speed
fast
slow
time

28. Getting faster? (accelerating)
speed
time

29. Getting faster? (accelerating)
speed
Constant acceleration
time

30. Getting faster? (accelerating)
speed
The area under the graph gives the distance travelled
time

31. Example:
speed
time

32. A dog falling from a tall building (no air resistance)
speed
time

33. A dog falling from a tall building (no air resistance)
speed
time

34. A dog falling from a tall building (no air resistance)
speed
Area = height of building
time

35. Be careful!
speed
time
distance
time

36. No movement
speed
time
distance
time

37. Constant speed
speed
time
distance
time
Area = distance travelled

38. Constant acceleration
speed
time
distance
time
Area = distance travelled

39. Too easy? I have a challenge for you!
Can you watch the following video clip and use a stopwatch to determine how far the car travelled?
I will provide you with a stopwatch and a table to fill in!

42. Activity
Plot these results on a speed time graph, with time on the bottom axis (the x axis) and speed on the side axis (the y axis).
Label the points where there is a change in motion A,B,C,D,E,F,H,I,J and K.
Example: point A is at time 0 and speed 20.

43. Distance travelled in m
Time in s
Distance travelled in m 60
200
120
400
180
240
300
800
360
1200
420
480
1600
540
2000
600
2200
The table shows the data of a man’s journey from home to town. Use the data to accurately plot a distance/time graph of the journey.
1.The man catches a bus in to town. How long does he wait for the bus?
2.What is the average speed of the man walking?
3.How long would the journey have taken on foot?4.What could be happening between 360s-420s?
5.How far does he travel on the bus?
6.What is the average speed of the bus between stops?

44. Distance/Time graph of a man catching a bus in to town