Idea 10of 12Builds onWhere she isStart to finish
The walk as a line
Can one line show the whole walk?
Today you'll discover
- a graph that the walk itself draws
- what the dot and the line stand for
- why the line climbs, then falls
Think firstTime runs across. Where she is runs up.
As she walks east, away from the flag, what will the line do?
Predict first. Then press play and watch the walk draw the line.
A graph with time along the bottom and position east of the flag up the side. After a prediction, a player: as the clock runs, Amara moves along a ground line above the graph while a dot traces a line that climbs to six metres at four seconds and falls back to zero at ten seconds. Then the finished line with its turning point; then the ground drawn flat under the graph with one point read off; then the whole line named. The last step shows a line that climbs, runs flat and falls, and asks what the flat part meant.
See the whole ideathe big idea and the key word, in one place
The big idea
Dot: where she is now. Line: where she has been.
Easy to get wrongThe graph is not the path she walked. Its height shows position, not hills.
Key word
- position–time graph
- a graph with time on the horizontal axis and position on the vertical axis, so one line tells the whole trip
About this modelThe line is not the path. Up means further east, not uphill; a falling line means walking back, not walking downhill.
The line is not the path. Up means further east, not uphill; a falling line means walking back, not walking downhill.
Ready to use it?
- Read where a walker is, and when, off a graph.