Idea 11of 12Builds onThe walk as a line
Not a hill
Is the line a picture of the ground?
Today you'll discover
- how to read one point as a time and a place
- why the line is not a hill
- what a falling line really means
Think firstThe line climbs. Did she walk uphill?
The line climbs. Did she walk uphill?
Answer first, then press Next. One point is read off the line, then drawn on the ground.
Amara's position–time graph. After a prediction, one ringed point on the climbing leg at two seconds, with dashed lines dropping to the time axis and across to the position axis, labelled three metres east. Then a short ground line drawn under the graph with a flag and a standing figure three metres along it, to show the reading is a place on flat ground. The last step shows the falling leg and asks what she is doing.
See the whole ideathe big idea and the key word, in one place
The big idea
Height on the graph is a place, not a hill.
Easy to get wrongA graph that climbs and falls looks like a hill. It is not one. Read any point as a time and a place, and the hill disappears.
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 a point on a graph as a time and a place, not a height.