Unit 4 – Mass, Weight and Density
4.2 – Relationship between Mass and Weight
This section covers the following syllabus (Physics 5059) requirements.

The weight W of an object of mass m is given by:
W = mg
where
W = weight (in N)
m = mass (in kg)
g = gravitational field strength (in N/kg)
mass, 3 kg
gravitational
force, weight
= 30 N
gravitational
field strength,
g = 10 N/kg
Earth
Difference between Mass and Weight
Mass
It is the amount of matter in an object.
SI unit is kilogram (kg).
It is a scalar (does not have a direction).
It is constant everywhere.
It is measured with a beam balance or
electronic balance.
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Weight
It is the gravitational force acting on an object.
SI unit is Newton (N).
It is a vector (has a direction).
It varies from place to place.
It is measured with a spring balance.