A-LevelPhysicsDynamics9702/12 · Oct/Nov 2015 · Q101 Mark
A bus takes a time of 25s to reach a constant speed while travelling in a straight line. A graph of speed v against time t is shown. [Figure showing a speed-time graph] Which graph shows the variation with t of the resultant force F on the bus?
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AGraph A: Force initially high, drops sharply, then constant low force for some time, then zero.
BGraph B: Force smoothly increases, then decreases to zero.
CGraph C: Force smoothly increases to a maximum, then decreases to zero.
DGraph D: Force initially low, increases to a peak, then decreases to zero.
✓ Correct answer
A: Graph A: Force initially high, drops sharply, then constant low force for some time, then zero.
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