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:: If the [[Resultant Force|resultant force]] on an [[object]] is not [[zero]] then an [[object]] will [[accelerate]] (change [[speed]] or direction).
: This means that if an [[object]] is [[observe]]d changing [[speed]] or direction then there must be an [[Unbalanced Forces|unbalanced force]] acting on it.
===Examples===
Stationary Object - The [[object]] remains at rest because the [[force]]s and [[Balanced Forces|balanced]].
Constant Speed in a Straight Line - The [[object]] remains at a constant [[speed]] and continues in a straight line because the [[force]]s acting on the [[object]] are [[Balanced Forces|balanced]].
Constant Speed but Changing Direction - The [[object]] is changing direction because there are [[Unbalanced Forces|unbalanced forces]] acting on it.
Changing Speed - The [[object]] is changing speed because there are [[Unbalanced Forces|unbalanced forces]] acting on it.