
Helicopter ViewA video for a teacher to use in a Mathematics lesson showing how a distancetime graph can be constructed from a series of photographs.The 'photographs' of the situation which are displayed side by side promote a good understanding of the concept of a distancetime graph. They make it clear that the passage of time is shown on the horizontal axis and the distance travelled on the vertical axis. Further class discussion might illuminate the fact that the steepness or gradient of the line graph is related to the speed of the vehicle. A positive gradient indicates a velocity away from the reference point while a negative gradient represents a velocity in the opposite direction. A gradient of zero represents the vehicle coming to rest. In the real world a more accurate graph of the situation would be a smooth curve rather than a number of straight lines. After viewing the video above have a look at some other distancetime graphs for students to interpret. You could also try answering some questions in the Travel Graphs online exercise. 

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