Weight (W = m g)
AQA GCSE Physics calculation · part of the free Calculation Climb
Weight is the force of gravity on a mass: W = m g. Mass in kg, g is the gravitational field strength (≈ 9.8 N/kg on Earth), weight in newtons (N).
How to do it — step by step
- weight = mass × gravitational field strength.
- W = m g. (Rearrange: mass = weight ÷ g.)
Worked example
Weight of a 5 kg bag, g = 9.8 N/kg.
W = 5 × 9.8 = 49 N
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