1a
2 marks
A bicycle manufacturer carries out tests on the braking system of their new model.
A cyclist on this new bicycle travels at a constant initial speed U.
The cyclist applies the brakes at time t = 0 and the bicycle comes to a stop at time t = 2.0 s.
Fig. 20.1 shows the variation of the braking force F on the bicycle with time t.
Fig. 20.1
Use Newton’s second law of motion to explain the physical quantity represented by the area under the graph shown in Fig. 20.1.
1b
2 marks
The total mass of cyclist and bicycle is 71 kg.
Use Fig. 20.1 to calculate the initial speed U.
U = .................................. ms–1
1c
2 marks
Complete Fig. 20.2 to show the variation of the speed of the bicycle from t = 0 to t = 2.0 s.
Fig. 20.2
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to determine g.