Units (Forces and Motion)

2 marks · Exam Level

State the SI unit (name and symbol) for each of the following physical quantities: (i) Turning effect of a force (ii) Acceleration

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(i) newton metre (Nm), (ii) metre per second squared (m/s²)

Also accept: (i) newton metre, Nm; (ii) metres per second squared, m/s^2

Common mistakes: Writing 'joule' for turning effect; Writing 'm/s' or 'm/s2' without correct squared symbol for acceleration

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Marking points

B1 · 1 mark · Correct SI unit and symbol for turning effect of a force (newton metre, Nm)

B2 · 1 mark · Correct SI unit and symbol for acceleration (metre per second squared, m/s²)

Worked solution

(i) The SI unit for turning effect of a force is newton metre (Nm). (ii) The SI unit for acceleration is metre per second squared (m/s²).