May/June 2026 Paper 51

2026 · 2 questions · 10 parts · 30 marks

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1Experimental Planning SafetyHard15 marks
A rod is fixed horizontally. A solid bar of mass is attached to the rod by two vertical strings so that the bar is horizontal, as shown in Figure 1.1.
Figure 1.1, a rod fixed horizontally with a solid bar suspended below it by two vertical strings; the strings hang a distance L below the rod down to the bar, and each string is a horizontal distance a from the centre of the bar, with a dashed vertical line marking that centre
The vertical strings are equal horizontal distances from the centre of the bar. The separation between the rod and the bar is . One end of the bar is displaced horizontally and then released. The bar rotates with oscillations about its centre. The period of the oscillations is . It is suggested that is related to by the relationship
where and are constants. Plan a laboratory experiment to test the relationship between and . Draw a diagram showing the arrangement of your equipment. Explain how the results could be used to determine values for and . In your plan, you should include:
  • the procedure to be followed
  • the measurements to be taken
  • the control of variables
  • the analysis of the data
  • any safety precautions to be taken
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