Weight
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20 Terms
Weight definition
Force acting on an object due to gravity
Weight symbol
W
Weight unit
Newtons (N)
Mass definition
Amount of matter in an object
Mass symbol
m
Mass unit
Kilograms (kg)
Gravity definition
Gravitational field strength acting on mass
Gravity symbol
g
Gravity unit
N/kg
Earth’s gravity
Approximately 10 N/kg
Moon’s gravity
About 1.6 N/kg
Weight formula
Weight = mass × gravitational field strength
Symbol equation
W = m × g
Effect of gravity change
Weight changes; mass stays the same
Mass vs weight
Mass is constant; weight depends on gravity
Example
5 kg mass on Earth → weight = 50 N
Another example
5 kg mass on Moon → weight = 8 N
Direction of weight
Always acts downward towards centre of planet
Measured with
Newton meter (spring balance)
Key idea
Weight is a force caused by gravity; mass is the amount of matter
