Travel graphs
The two types of graphs you will meet are distance/time and speed/time.
Time is almost always plotted on the x-axis!
Distance/time
If you show a graph of a journey showing distance travelled (on the y-axis) against time (on the x-axis):
1. The gradient (or slope) of the graph represents the speed.
2. A horizontal section indicates that you have stopped.
3. A section sloping up means you are going away.
4. A section sloping down means you are coming back.
5. The steeper the line, the faster you are going.
Speed/time
1. The gradient (or slope) of the graph represents the acceleration.
2. The area under the graph (for any section) is the distance travelled (in that section).
3. A horizontal section indicates constant speed (no acceleration).
4. A section sloping up means accelerating.
5. A section sloping down means slowing down.
6. The steeper the line, the quicker the acceleration.
Graphs to represent data
Graphs used to represent data include:
Bar charts (sometimes called frequency diagrams)
Line graphs
Frequency polygons
Cumulative frequency graphs
Scatter diagrams
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