A-LevelPhysicsDynamics9702/12 · May/June 2022 · Q91 Mark
A stone S and a foam rubber ball R are identical spheres of equal volume. They are released from rest at time t = 0 and fall vertically through the air. Both reach terminal velocity. Which graph best shows the variation with time t of the speed v of the stone and of the rubber 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.
A[Graph A: S reaches terminal velocity faster than R, both curved upwards to a constant speed]
B[Graph B: S reaches terminal velocity faster than R, both curved upwards to a constant speed, with R's initial curve being less steep]
C[Graph C: S and R reach terminal velocity at the same time and follow the same curved path upwards]
D[Graph D: R reaches terminal velocity faster than S, both curved upwards to a constant speed]
✓ Correct answer
B: [Graph B: S reaches terminal velocity faster than R, both curved upwards to a constant speed, with R's initial curve being less steep]
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