Physics 5054/22 — October/November 2022

Cambridge O-Level · Theory · worked solutions for every part, with the mark scheme

questions

marks

105

minutes

Topics Energy, Work and Power · Transfer of Thermal Energy · Kinematics · Forces · Mass, Weight and Density · Sound · +9 more

Q17MKinematicsForcesFree sample

A train travels along a straight horizontal track. At time $t = 0$ , the train passes through station P at constant speed without stopping.

The driver applies the brakes $70\text{ s}$ before reaching station Q. The train decelerates.

Fig. 1.1 is the speed–time graph for the train from $t = 0$ until it stops at station Q.

Fig. 1.1

(a)

Using Fig. 1.1, determine the distance between station P and station Q.

distance = ______

(b)

The mass of the train is $3.8 \times 10^5\text{ kg}$ .

(i)

Determine the deceleration of the train in the $70\text{ s}$ before it stops at station Q.

deceleration = ______

(ii)

Calculate the resultant force on the train as it decelerates.

resultant force = ______

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