Velocity-time graphs
2 marks · NormalA velocity–time graph for a moving object is curved upwards. Explain what this shape tells you about the object's acceleration.
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The object’s acceleration increases (not constant). The speed increases faster as time passes.
Must show: states acceleration is increasing, describes changing gradient
Also accept: The gradient of the graph increases
Common mistakes: calls it constant acceleration
Show mark scheme and worked solution
Marking points
B1 · 1 mark · States that acceleration is increasing or not constant.
B2 · 1 mark · Links curve (changing gradient) to speed increasing faster.
Worked solution
A curve upwards means acceleration is increasing — the object’s velocity increases more quickly as time passes.