CAIE IGCSE Physics 1.7.1.4 Kinetic Energy Ek 1 2 Mv 2 Questions

Practise calculating kinetic energy with Eₖ = ½mv² and analysing how it changes with mass and speed using CAIE IGCSE Physics questions and mark schemes.

Exam points

Calculate kinetic energy using Eₖ = ½mv² and analyse how it changes with mass and speed.

[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 kinetic energy of trolley Q when it moves at $0.36 \mathrm{~m} / \mathrm{s}$ .
kinetic energy of Q =

0.078J
(k.e. = ) $\frac{1}{2} m v^{2}$ OR (k.e. = ) $\frac{1}{2} \times 1.2 \times 0.36^{2}$
(k.e. = ) $\frac{1}{2} \times 1.2 \times 0.36^{2}$

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CAIE IGCSE Physics 1.7.1.4 Kinetic Energy Ek 1 2 Mv 2 Questions question 1