2025 · M/J · 5054/22 | Q3

0/46parts marked · 0 of 80 marks

Question (3 of 9)8 marks · Practise this topic →

Options

Theory: answer all nine questions. Show working and units. For drawings or plotted graphs, upload a clear photo of your sketch on the supplied figure.

Fig. 3.1 shows a flat tyre on a car. The tyre needs to be inflated.

The force exerted by the flat tyre on the road is 1350 N.

The area of the flat tyre in contact with the road is 0.0070 m².

(a)(i)Calculate the pressure exerted by the flat tyre on the road.

Fig. 3.1 — see the question text for what it shows

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[2 marks]

Air is pumped into the tyre to inflate it. This increases the pressure inside. The force exerted by the tyre on the road does not change.

(a)(ii)State how the area of the tyre in contact with the road changes.

Answer guidance

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

[1 mark]

Inside the inflated tyre, a particle of air collides against the wall of the tyre.

(b)(i)Define ‘momentum’.

[1 mark]

(b)(ii)Using ideas about momentum, explain why there is a force on the wall of the tyre as the particle collides with it.

Answer guidance

Using You must use the thing it names. An answer that reaches the right value another way may not score.

[2 marks]

As the car moves, the temperature of the air inside the tyre increases. The increase in temperature causes an increase in the pressure of the air.

(c)Using ideas about particles, explain why the pressure increases.

Answer guidance

Using You must use the thing it names. An answer that reaches the right value another way may not score.

[2 marks]

5054/22/M/J/25Cambridge O Level Physics 5054 · May/June 2025 · Paper 2 variant 2 · Question 3