Specification references covered: P2.16–P2.18 (W = mg; mass vs weight; gravitational field strength; measuring weight; inertial mass)

The Topic Mastery Sheet gives both calculations with exact mark scheme values: W = 15 000 × 10 = 150 000 N (2 marks); and g = 24 800 ÷ 15 000 = 1.653 → 1.7 N/kg to 2 s.f. (4 marks, bald answer accepted). The MCQ answers for mass conversion (B: 0.150 kg) and equation selection (D: mass(kg) × 10) are given explicitly. The error box addresses the gram/kilogram conversion failure that is by far the most common calculation error in this subtopic.

The Student Exam Practice Sheet (20 marks) includes: full mass/weight comparison table; mass unit MCQ; weight equation MCQ; both lunar module calculations; cat on Moon explanation; mass vs weight definition; measurement method; Earth/Mars weight comparison; and Higher inertial mass definition.

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