Physics 9702 · AS & A Level · Non-uniform motion

Non-uniform motion — practice question

Fig. 2.1 shows how the car’s velocity $v$ varies with time $t$. At $t = 0$, the driver notices an obstacle in the road. A little later, the driver applies the brakes. The car then moves in two stages, as shown in Fig. 2.1.
(a(i))[1]

Use Fig. 2.1 to describe the car’s velocity in stage 1.

(a(ii))[1]

Use Fig. 2.1 to describe the car’s velocity in stage 2.

(b(i))[2]

Calculate the distance travelled by the car between $t = 0$ and $t = 3.5\,\text{s}$.

(b(ii))[3]

The car has a total mass of $1250\,\text{kg}$. Determine the total resistive force acting on the car in stage 2.

(c(i))[1]

For safety reasons, drivers are advised to travel more slowly. For stage 1, describe and explain how the distance travelled changes for the same car and driver when travelling at half the initial speed shown in Fig. 2.1.

(c(ii))[2]

For safety reasons, drivers are advised to travel more slowly. For stage 2, describe and explain how the distance travelled changes for the same car and driver when travelling at half the initial speed shown in Fig. 2.1.

(c)

For safety reasons, drivers are advised to travel more slowly. For each stage, describe and explain how the distance travelled changes for the same car and driver when travelling at half the initial speed shown in Fig. 2.1.

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