A pendulum consists of a solid sphere suspended by a string from a fixed point P, as shown in Fig. 3.1.
[Figure 3.1]
The sphere swings from side to side. At one instant the sphere is at its lowest position X, where it has kinetic energy 0.86 J and momentum 0.72 Ns in a horizontal direction. A short time later the sphere is at position Y, where it is momentarily stationary at a maximum vertical height h above position X.
The string has a fixed length and negligible weight. Air resistance is also negligible.

Q: What topic does this question test?

This question tests Work, energy and power in A-Level Physics (syllabus code 9702). It is worth 10 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Physics May/June 2021 examination, Paper 2 Variant 1 (9702_s21_qp_21.pdf).

Question

A pendulum consists of a solid sphere suspended by a string from a fixed point P, as shown in Fig. 3.1.
[Figure 3.1]
The sphere swings from side to side. At one instant the sphere is at its lowest position X, where it has kinetic energy 0.86 J and momentum 0.72 Ns in a horizontal direction. A short time later the sphere is at position Y, where it is momentarily stationary at a maximum vertical height h above position X.
The string has a fixed length and negligible weight. Air resistance is also negligible.

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