CAIE IGCSE Physics 1.6.4 Resultant Force As Change in Momentum Questions

Practise using impulse and change in momentum to calculate average force during collisions and interactions with CAIE IGCSE Physics questions and mark schemes.

Exam points

Use impulse and change in momentum to calculate average force during collisions and interactions.

[Maximum number: 2]

Fig. 2.1 shows a rocket and its exhaust gases.

Fig. 2.1

The exhaust gases are emitted from the rocket with a velocity of $1400 \mathrm{~m} / \mathrm{s}$ and at a rate of $2800 \mathrm{~kg} / \mathrm{s}$ .

Show that the force exerted on the rocket by the exhaust gases is 3900 kN .

State the equation you use.

$F \Delta t=\Delta\{m v\} \mathbf{O R}(F=) \Delta\{m v\} / \Delta t \mathbf{O R}(F=) \Delta p / t$ $\{2800 \times 1400\}(/ 1)=3920000 \mathrm{~N}$ OR $\{2800 \times 1400\}(/ 1)=3920 \mathrm{kN}$

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CAIE IGCSE Physics 1.6.4 Resultant Force As Change in Momentum Questions question 1