The Newton’s first law states that the object remains at rest in a straight line unless an external force is introduced.  The changes in the motion mostly involve the acceleration.  The statement in the first Newton’s law is interpreted as inertia when it explains how the object remains in their state of the motion unless there is a force which is acted upon. The second Newton’s law applies as a special case of the first Newton’s law. The external force in second Newton’s law is usually zero. The first Newton’s law has the implications of universe fundamental symmetry. The state of the motion must stay natural when at rest. In an example of the centripetal force, the string must give the force to move the desired ball in the circle. In case the string breaks, then the ball moves off the straight line.  The second Newton’s law applies to the physical phenomena but not to the fundamental principle of conservation laws. The second Newton’s law is applicable if the force is an external force.  The second Newton’s law does not apply to the mass which keeps changing either from the addition or loss of the material.  In third Newton’s law, all the forces found in the universe occur in the equal and opposite pairs. The third Newton’s law does not have isolated forces.  The third Newton’s law has the fundamental symmetry principles found in the universe. 

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