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weight
the force of gravity
Newton’s First Law (The Law of Inertia)
An object at rest will remain at rest and an object in motion will remain in motion in the same direction at a constant velocity unless acted upon by an unbalanced force.
When the forces are balanced and the object is not moving
they are in static equiliberium
When the forces are balanced and the object is moving at a constant velocity
They are in dynamic equiliberium
Inertia
the amount an object will resist a change in motion.
Intertia depends on
mass
A object with greater mass resists change in motion
more inertia it has
Gravitational mass
measured by measuring an object’s weight using weight = mg
Note 
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