Newton's 1st law; a special case?

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Newton's 1st law is considered a special case of his 2nd law because it defines inertial frames of reference, where an object moves with constant velocity in the absence of external forces. This law establishes the conditions under which Newton's 2nd law is applicable. Essentially, it highlights that if no net force acts on an object, it will maintain its state of motion, reinforcing the concept of inertia. Therefore, the first law serves as a foundational principle for understanding motion in inertial frames. The relationship between the two laws emphasizes the importance of reference frames in classical mechanics.
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Why we called Newton's 1st law is a special case of Newton's 2nd Law?
what case of 2nd law is perfering here?
 
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abrowaqas said:
Why we called Newton's 1st law is a special case of Newton's 2nd Law?
what case of 2nd law is perfering here?

Although Newton's 1st law might appear simply to be a special case of his 2nd law, it has also been interpreted to be Newton's definition of inertial frames of reference. To paraphrase the great man: "IF an object that experiences no external force moves with constant velocity, then that object is being viewed from an inertial frame of reference." In brief, Newton's 1st law delineates the class of reference frames in which his 2nd law applies.
 

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