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Newton's First Law of Motion

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friction
the force that one surface exerts on another when the two rub against each other
inertia
the tendency of an object to resist any change in its motion
law of inertia
Every body continues in its state of rest, or of motion in a straight line at constant speed
newton's first law
an object at rest will stay at rest, an object that is moving will stay moving unless disturbed by an unbalenced force.
mass
a measure of an object's inertia
kilogram
basic SI unit of mass
weight
the measure of the pull of gravity between an object and Earth