CAIE IGCSE Physics 1.7.2.1 Mechanical or Electrical Work Done Is Questions

Practise defining work done as energy transferred by a force and calculating W = Fd with CAIE IGCSE Physics questions and mark schemes.

Exam points

Define work done as the energy transferred by a force and calculate W = Fd.

[Maximum number: 2]

A train of mass $1.8 \times 10^{5} \mathrm{~kg}$ is at rest in a station. At time t=0, the train begins to accelerate along a straight, horizontal track and reaches a speed of $20 \mathrm{~m} / \mathrm{s}$ at $t=15 \mathrm{~s}$ . The train continues at a speed of $20 \mathrm{~m} / \mathrm{s}$ for 10 s.

At $t=25 \mathrm{~s}$ , the driver applies the brakes and the resistive force on the train causes it to decelerate uniformly to rest in a further 24 s.

Fig. 4.1 is an incomplete distance-time graph for this journey.

Fig. 4.1

While the train decelerates to rest, it does work against the resistive force and its kinetic energy decreases.

Define work done.

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CAIE IGCSE Physics 1.7.2.1 Mechanical or Electrical Work Done Is Questions question 1