Weight Summary

Mass is a measure of the amount of matter in an object.
Unit: kilogram (kg)

Weight is the force due to gravity on a mass.
Unit: newton (N)

On Earth, the force of gravity is about 10 N/kg, so a 50 kg person weighs 500 N.

Weight = mass × gravity
W (N) = m (kg) × g (N/kg)

N.B. Mass in kilograms!

Different planets have different gravity, so the weights of objects will be different.

The mass of objects is unaffected by gravity.

Forces & Motion Menu

Weight Questions