CAIE IGCSE Physics 1.7.1.3 Principle of the Conservation of Questions

Practise applying conservation of energy to explain and calculate changes between energy stores with CAIE IGCSE Physics questions and mark schemes.

Exam points

Apply conservation of energy to explain and calculate changes between energy stores.

[Maximum number: 2]

A girl holds a rubber ball out of a window of a tall building. The mass of the ball is 0.20 kg . The ball is at rest 10 m above a concrete path.

The girl releases the ball and it falls towards the path. The ball strikes the path and bounces vertically upwards.

Fig. 1.1 shows the ball falling towards the path.

Fig. 1.1

The speed of the ball immediately before it strikes the path is $14 \mathrm{~m} / \mathrm{s}$ .
The speed of the ball immediately after it strikes the path is $12 \mathrm{~m} / \mathrm{s}$ .

Calculate the kinetic energy of the ball immediately after it strikes the concrete path.

kinetic energy =

14 J
$\left(E_{\mathrm{k}}=\right) \frac{1}{2} m v^{2} \mathbf{O R} \frac{1}{2} \times 0.2(0) \times 12^{2}$

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CAIE IGCSE Physics 1.7.1.3 Principle of the Conservation of Questions question 1