Units (Forces and Motion)

2 marks · Hard

Write the correct SI unit and symbol for acceleration. Then, using SI units, explain what the symbol 'm/s²' means in words.

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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Acceleration: metre per second squared (m/s²). This means a change in velocity of 1 metre per second every second.

Must show: m/s² definition, meaning as 'per second each second'

Also accept: metres per second squared

Common mistakes: saying m/s

Show mark scheme and worked solution

Marking points

B1 · 1 mark · Correct SI unit and symbol given: metre per second squared (m/s²).

B2 · 1 mark · Clear explanation that 1 m/s² means velocity changes by 1 m/s every second.

Worked solution

Acceleration is measured in metres per second squared (m/s²). This unit means that an object’s velocity increases by 1 m/s every second.