O-LevelPhysicsKinematics5054/11 · Oct/Nov 2012 · Q31 Mark
A ball starts to roll down a steep slope and then along rough horizontal ground. Which graph best shows the speed of the ball?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Aspeed-time graph. Speed increases linearly from zero, then remains constant, then decreases linearly to zero.
Bspeed-time graph. Speed increases from zero with a decreasing positive gradient (curved upwards, concave down), then remains constant, then decreases with a decreasing negative gradient (curved downwards, concave up) to zero.
Cspeed-time graph. Speed increases from zero with an increasing positive gradient (curved upwards, concave up), then decreases with an increasing negative gradient (curved downwards, concave up) to zero.
Dspeed-time graph. Speed increases linearly from zero, then remains constant, then decreases with a decreasing negative gradient (curved downwards, concave down) to zero.
✓ Correct answer
D: speed-time graph. Speed increases linearly from zero, then remains constant, then decreases with a decreasing negative gradient (curved downwards, concave down) to zero.
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