Physics (AS & A Level) · Oct / Nov 2025 · Paper 54 · Question 1

Fig. 1.1 shows a horizontal turntable. r C P turntable Fig. 1.1 Point C is at the centre of the turntable. Point P is a distance r from the centre. Fig. 1.2 shows a side view of a d.c. motor attached to the turntable with a belt. C belt terminals motor turntable turntable base Fig. 1.2 The motor is used to rotate the turntable at frequency f0. The motor is switched off and the turntable continues to rotate at frequency f0. A sphere of adhesive putty of mass m is dropped onto the turntable at point P. The frequency of the turntable is now f. It is suggested that f is related to m by the relationship Kf0 f = βK + mr 2 where β and K are constants. Plan a laboratory experiment to test the relationship between f and m. Draw a diagram showing the arrangement of your equipment. Explain how the results could be used to determine values for β and K. 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. 3 Diagram 4 [15]

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