(a) A student pushes a drawing pin into a wooden board, as shown in Fig. 4.1. [Figure 4.1] The area of the pin in contact with the finger is 5.0 × 10⁻⁵m². The student pushes downwards with a force of 26 N. The mass of the drawing pin is very small. (b) Fig. 4.2 shows water emerging from a plastic bag that contains a number of small holes. [Figure 4.2]

1. (a)(i)Calculate the pressure exerted by the finger on the drawing pin.[2]
2. (a)(ii)Compare the force exerted by the finger on the drawing pin with the force exerted by the drawing pin on the wooden board.[1]
3. (a)(iii)Explain why the drawing pin goes into the wooden board but not into the finger.[2]
4. (b)(i)Explain why the water emerges from each hole in a direction at right angles to the surface of the bag.[2]
5. (b)(ii)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.[1]

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