Exam-style question
Try this first
A 4 N force acts perpendicular to a beam 3 m from the pivot. Find the moment about the pivot.
- A.12 N m clockwise
- B.15
- C.9
- D.24
Model answer
What a good answer should say
- The correct answer is 12 N m clockwise.
This answer is tied to the objective: S1 Understand and use moments in simple static contexts..
Explanation
Why this works
Use the explanation to connect the worked answer back to S1 Understand and use moments in simple static contexts..
The distractors change the result or the form of the answer. The canonical solution reaches 12 N m clockwise, so 12 N m clockwise is the only option consistent with the working.
Maths method check
- Topic focus: Mechanics.
- Question style: practice.
- Reasoning demand: application.
- Check the operation, notation, units, and final answer form against the question before moving on.
Common mistake
No common mistake is linked to this question yet.