Theory: answer each printed part. For drawings, upload a clear photo of your sketch on the supplied figure; show working and units for calculations.
(a)(i)A student pushes a drawing pin into a wooden board, as shown in Fig. 4.1. The area of the pin in contact with the finger is 5.0 × 10⁻⁵ m². The student pushes downwards with a force of 26 N. The mass of the drawing pin is very small. Calculate the pressure exerted by the finger on the drawing pin. Give your answer in Pa.
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]
(a)(ii)A student pushes a drawing pin into a wooden board, as shown in Fig. 4.1. The area of the pin in contact with the finger is 5.0 × 10⁻⁵ m². The student pushes downwards with a force of 26 N. The mass of the drawing pin is very small. Compare the force exerted by the finger on the drawing pin with the force exerted by the drawing pin on the wooden board.
Answer guidance
Compare Say something about both, and make the comparison explicit rather than leaving it implied.
[1 mark]
(a)(iii)A student pushes a drawing pin into a wooden board, as shown in Fig. 4.1. The area of the pin in contact with the finger is 5.0 × 10⁻⁵ m². The student pushes downwards with a force of 26 N. The mass of the drawing pin is very small. Explain why the drawing pin goes into the wooden board but not into the finger.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
[2 marks]
(b)(i)Fig. 4.2 shows water emerging from a plastic bag that contains a number of small holes. Explain why the water emerges from each hole in a direction at right angles to the surface of the bag.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
[2 marks]
(b)(ii)Fig. 4.2 shows water emerging from a plastic bag that contains a number of small holes. The holes at A and B are the same size. Explain why the water emerges faster from the hole at A than from the hole at B.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
[1 mark]
5054/21/M/J/23Cambridge O Level Physics 5054 · May/June 2023 · Paper 2 variant 1 · Question 4