Units (Forces and Motion)
2 marks · Normal(a)[2 marks]
A force of 12 N acts over a perpendicular distance of 0.4 m. Calculate the moment produced and state its SI unit.
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(a) moment = 4.8 N m
Also accept: 4.8 N m
Common mistakes: incorrect substitution; wrong units
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Marking points
M1 (a) · 1 mark · Substitutes values correctly into the moment equation, or shows moment = force × distance. (follow-through)
A1 (a) · 1 mark · Correct final answer with correct SI unit (N m or Nm).
Worked solution
Moment = force × perpendicular distance
M = 12\ \mathrm{N} \times 0.4\ \mathrm{m} = 4.8\ \mathrm{N\ m}