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AQA GCSE · Question 05.4 · Forces
Which section of Figure 9 shows the person walking the slowest? Give a reason for your answer.
Which section of Figure 9 shows the person walking the slowest? Give a reason for your answer.
How to approach this question
1. Understand that the gradient (steepness) of a distance-time graph represents speed.
2. A steeper line means a higher speed, and a shallower (less steep) line means a lower speed.
3. Compare the steepness of sections A, B, and C.
4. Select the section with the shallowest gradient and explain why.
Full Answer
On a distance-time graph, the gradient of the line is equal to the speed.
- A steep gradient means a large distance is covered in a short time, so the speed is high.
- A shallow gradient means a small distance is covered in a long time, so the speed is low.
- A horizontal line (zero gradient) means the distance is not changing, so the object is stationary (speed is zero).
By comparing the sections:
- Section A is quite steep.
- Section B is much less steep (shallower) than A and C.
- Section C is the steepest.
Therefore, the person was walking slowest in section B because it has the shallowest gradient.
Common mistakes
✗ Choosing the steepest section (C), which represents the fastest speed.\n✗ Giving a reason that is not related to the gradient, e.g., "it's in the middle".
Practice the full AQA GCSE Physics Foundation Tier Paper 2
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