Units (Forces and Motion)

3 marks · Normal

For each of the following physical quantities, state their SI unit (name and symbol) clearly:

(a)

Acceleration

[1 mark]

(b)

Force

[1 mark]

(c)

Turning effect (moment of a force)

[1 mark]

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

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(a) metre per second squared (m/s^2 or m s^{-2})

(b) newton (N)

Common mistakes: Mixing up unit names and symbols; Giving non-SI units

Show mark scheme and worked solution

Marking points

B1 (a) · 1 mark · Correct SI unit name and symbol for acceleration: metre per second squared (m/s^2 or m s^-2)

B1 (b) · 1 mark · Correct SI unit name and symbol for force: newton (N)

B1 (c) · 1 mark · Correct SI unit name and symbol for moment: newton metre (Nm)

Worked solution

a) The SI unit for acceleration is metre per second squared. The symbol is m/s^2 or m s^{-2}.

b) The SI unit for force is newton. The symbol is N.

c) The SI unit for the turning effect (moment) is newton metre. The symbol is Nm.