Physics 5054 · O Level · Motion

Motion — practice question

Fig. 7.1 presents the speed-time graph of a car moving along a straight horizontal road.
(a(i))[3]

Describe how the car moves.

(a(ii))[3]

Using Fig. 7.1, calculate how far the car travels in the $24\,\text{s}$ shown. Show your working.

(a(iii))[2]

Calculate the average speed of the car for the journey.

(a(iv))[2]

A second car moves at a constant speed. It covers the same distance as the first car in the $24\,\text{s}$ journey. On Fig. 7.1, draw the speed-time graph for this second car.

(b(i))[1]

Complete Table 7.1 by filling in the missing value.

(b(ii))[2]

The driver’s reaction time to the hazard is the same at different speeds. Explain how the table shows this.

(b(iii))[2]

State how the thinking distance and the braking distance change when the driver is tired.

Worked solution & mark scheme

This 15-mark question has a full step-by-step worked solution and mark scheme. One marking point: Uniform acceleration during the first 10 s ($1.6\text{ m s}^{-2}$)

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