"The first law states that, an object would either stay at rest or move at a constant velocity until an unbalanced force acts on it".
This law deals with the inertia of an object.
Force is the doer of work and yet forces can act on something in a balanced manner so that there is now net force or unbalanced force. That is why an unbalanced force is essentially used in the law.
This law should be called being in an inertial frame of reference to be true and it does not make sense in non-inertial frames of reference.
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