CAIE IGCSE Physics 1.6.3 Apply the Principle of the Questions

Practise applying conservation of momentum to collisions, explosions and recoil situations with CAIE IGCSE Physics questions and mark schemes.

Exam points

Apply conservation of momentum to collisions, explosions and recoil situations.

[Maximum number: 3]

Fig. 2.1 shows two identical trolleys, P and Q, held at rest on a frictionless horizontal surface. A load is fixed to trolley P .

Fig. 2.1

There is a compressed spring between trolley P and trolley Q .
The trolleys are released. As the spring expands, it pushes the trolleys apart.
Trolley Q moves to the right at a constant speed of $0.36 \mathrm{~m} / \mathrm{s}$ .
The mass of each trolley is 1.2 kg . The mass of the load on trolley P is 1.5 kg .
The spring has negligible mass.

Calculate:

the speed at which trolley P moves to the left
speed of P=

$0.16 \mathrm{~m} / \mathrm{s}$
conservation of momentum OR $m_{\mathrm{P}} v_{\mathrm{P}}=m_{\mathrm{Q}} v_{\mathrm{Q}}$ OR $2.7 \times v_{\mathrm{P}}=1.2 \times 0.36$ OR $\left(m_{\mathrm{Q}} v_{\mathrm{Q}}=\right) 0.432$ seen
$\left(v_{\mathrm{P}}=\right) m_{\mathrm{Q}} v_{\mathrm{Q}} / m_{\mathrm{P}}$ OR $1.2 \times 0.36 / 2.7$

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CAIE IGCSE Physics 1.6.3 Apply the Principle of the Questions question 1