A plane, irregular lamina has a mass of 50 g. It hangs from a nail that passes through a small hole H near to the edge of the lamina. The nail acts as a pivot and the lamina can swing about it. The lamina is held in the position shown in Fig. 3.1, a small distance above a horizontal bench. [Figure 3.1] The centre of gravity of the lamina is at G.

1. (a)(i)The weight of the lamina is a force that acts downwards. Explain why the lamina experiences this downward force.[1]
2. (a)(ii)Calculate the weight of the lamina on Earth. weight = .......................... N[2]
3. (b)(i)The weight produces a moment about the pivot through H. Using Fig. 3.1, calculate the moment of the weight about the pivot. moment = .......................... N m[2]
4. (b)(ii)The lamina is now released from the position shown in Fig. 3.1. Describe what happens to the lamina from the time it is released until it stops moving.[3]

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