May/June 2026 Paper 53

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, seen from the side; the rod, the two strings (each a horizontal distance a from the centre of the bar, marked by a dashed vertical line), the separation L between the rod and the bar, the bar and the centre of the bar are labelled
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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