Velocity-time graphs
2 marks · NormalExplain how you could use a velocity–time graph to determine whether an object is moving with uniform acceleration.
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If the velocity–time graph is a straight line, the acceleration is uniform.
Must show: states line is straight, links straight line to uniform acceleration
Also accept: If the gradient is the same everywhere, the acceleration does not change
Common mistakes: thinking uniform means constant velocity
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States that the velocity–time graph is a straight line (not curved).
B2 · 1 mark · Links the straight line to constant/unchanging acceleration.
Worked solution
Check if the velocity–time graph is a straight line. If it is, the object has uniform (constant) acceleration because the gradient does not change.