Exam-style question
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An object weighs 10 N on Earth. What is its approximate mass in kilograms?.
- A.1 kg
- B.5 kg
- C.10 kg
- D.15 kg
Model answer
What a good answer should say
- 1 kg
Explanation
Why this works
Using the formula: weight = mass × gravitational field strength (g = 10 N/kg). Rearranging gives mass = weight / g.
Substituting gives: mass = 10 N / 10 N/kg = 1 kg. This estimate is realistic for small objects.
Common mistake
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