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. Show your working one step at a time.
Model answer
What a good answer should say
- The final answer is 12 N m clockwise.
- Use the moment formula force x perpendicular distance about the pivot.
- Set force = 4 N.
- Set perpendicular distance = 3 m.
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..
exam warm-up keeps the canonical answer 12 N m clockwise fixed before the model answer is written, so the worked solution and final answer agree.
Maths method check
- Topic focus: Mechanics.
- Question style: exam_style.
- Reasoning demand: recall.
- 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.