Exam-style question
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A 15 N force lifts a small object vertically through 4.0 m. Calculate the energy transferred by work done against gravity.
- A.60 J
- B.30 J
- C.45 J
- D.15 J
Model answer
What a good answer should say
- 60 J.
- the correct option
Explanation
Why this works
This question is differentiated by its physical context. A strong response identifies the relevant mechanics relationship, substitutes the values with units, and explains what the numerical result means in that context.
Common mistake
No common mistake is linked to this question yet.