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Mass
the amount of matter in an object
Weight
force acting on an object due to gravity
Relationship between weight and mass
weight of an object is directly proportional to its mass
The equation linking weight, mass and gravitational field strength
W = mg
W
The symbol for weight
m
The symbol for mass
g
The symbol for gravitational field strength (gravity)
Unit for gravitational field strength
Newtons per kilograms (N/kg)
Centre of mass
The single point that the weight of an object may be considered to be acting at
Newton meter
calibrated spring-balance used to measure an object's weight
Note 
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