Equation of motion (Newtonian mechanics) is:
F=ma
where
F: force
m: mass
a: acceleration
Every location in the universe is characterized by a gravitational field constant represented by the symbol g (sometimes referred to as the acceleration of gravity). Thus weight and mass can be related as follows:
Weight = mg
where
Weight: weight
m: mass
g: acceleration of gravity
Referance:
Mechanics: Newton's Laws of Motion (http://www.physicsclassroom.com/calcpad/newtlaws
)