Exam-style question
Try this first
A crane arm has a load that produces a 25 N force at a perpendicular distance of 4.0 m from the pivot. Calculate the clockwise moment about the pivot.
- A.100 Nm
- B.75 Nm
- C.50 Nm
- D.25 Nm
Model answer
What a good answer should say
- 100 Nm.
- 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.