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An irregular 50 g lamina hangs from a nail through hole H and can swing around the nail. Its centre of gravity is G.
Explain why the lamina experiences a downward weight force; its arrangement is in Fig. 3.1.
An irregular 50 g lamina hangs from a nail through hole H and can swing around the nail. Its centre of gravity is G.
Fig. 3.1
Explain why the lamina experiences a downward weight force; its arrangement is in Fig. 3.1.
Answer guidance
Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.
[1 mark]
(a)(ii)
Calculate the lamina’s weight on Earth using Fig. 3.1.
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]
(b)(i)
Using Fig. 3.1, calculate the moment of the weight about pivot H.
Answer guidance
Using You must use the thing it names. An answer that reaches the right value another way may not score.
[2 marks]
(b)(ii)
The lamina is released from the position in Fig. 3.1. Describe its motion until it stops moving.
Answer guidance
Describe Say what happens, in order. Reasons are not required unless the question also asks why.
[3 marks]
5054/22/O/N/23Cambridge O Level Physics 5054 · Oct/Nov 2023 · Paper 2 variant 2 · Question 3