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: '''Newton's First Law''' describes the fact that:
:: If the [[Resultant Force|resultant force]] on an [[object]] is zero then it will continue to move at a constant [[velocity]].
:: 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.