Quote:
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If a body is not restrained from movement there will be two equal and opposite moving forces: the motion producing force and the inertial force opposing it.
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Seems to me that if the inertial force is equal and opposite to the motive force, the body ain't going anywhere. Therefore, it would be "restrained from movement." For a body to go somewhere, the motive force has to be greater than the inertial force.