Distance-time graphs
2 marks · NormalState two features of a distance–time graph that show an object is moving with constant speed.
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The graph is a straight line; the line has a constant (unvarying) slope.
Also accept: straight line that is not horizontal; gradient of line is constant; equal distances covered in equal times
Common mistakes: saying the graph is flat (which means stationary); saying the line is curved
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Marking points
B1 · 1 mark · States that the graph is a straight line (not horizontal).
B2 · 1 mark · States that the gradient is constant or has constant slope.
Worked solution
1. The distance–time graph is a straight (diagonal) line. 2. The line has a constant gradient (slope).