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AQA · GCSE · Combined Science · Higher

Mass of the player calculation

Q02.6 3 marks

The player accelerates at 25 m/s2^2 when a resultant force of 1800 N acts on her. Calculate the mass of the player.

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Marking points

  1. 1 Substitute 1800 N and 25 m/s2^2 into F=maF=ma.
  2. 2 Rearrange to calculate m=180025m=\frac{1800}{25}.
  3. 3 Give the mass as 72 kg72\ \mathrm{kg}.

Full-mark answer

F=maF=ma, so 1800=m×251800=m\times25. Therefore m=180025=72 kgm=\frac{1800}{25}=72\ \mathrm{kg}.

Why this answer loses marks

45000 kg

This multiplies force by acceleration rather than dividing force by acceleration.

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