A-LevelPhysicsGravitational fieldsMay/June 2020Paper 4 Q110 Marks
An isolated solid sphere of radius r may be assumed to have its mass M concentrated at its centre. The magnitude of the gravitational potential at the surface of the sphere is φ. The sphere in (b) is a planet with radius r of 6.4 × 10⁶ m and mass M of 6.0 x 10²⁴ kg. The planet has no atmosphere. A rock of mass 3.4 x 10³ kg moves directly towards the planet. Its distance from the centre of the planet changes from 4r to 3r.
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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