Exam-style question
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A 25 N horizontal force moves a trolley 2.0 m. Calculate the work done and state the condition needed for W = Fs to apply directly.
- A.50 J
- B.25 J
- C.75 J
- D.100 J
Model answer
What a good answer should say
- 50 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.