12 questions linked to/from Why is Newton's first law necessary?
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### Difference between first newton's law and second newton's law ? [duplicate]

the first and second laws of newton are both similar, so why do we need the first law if it is the same as the second? what is the big difference between these?
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### Newton's first law of motion a corollary of second law? [duplicate]

His first law of motion states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. That means, delta(...
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### Why is Newton's First Law not considered a vacuous statement? [duplicate]

How did Newton come to postulate the law of inertia when every inertial body that he was considering was (by his own other hypotheses) being acted on by the force of universal gravitation. In other ...
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### Is Newton's First Law an actual law, or just the definition of force? [duplicate]

Newton's first law, as you all know it, states: Every body perseveres in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces ...
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### Question on Newton's Laws [duplicate]

Newton's first law can be derived from his second law. Then why did he put forth the first law, when it's already contained in second law? My teacher was saying that first law is valid for an ...
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### Why did Newton state his first law separately even though it is apparently a direct consequence of the second law? [duplicate]

If $F=0$, $F=ma \implies m\frac{(v-u)}{t}=0\implies v-u=0 \implies v=u$ Which is essentially Newton's first law.
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### History of interpretation of Newton's first law

Nowadays it seems to be popular among physics educators to present Newton's first law as a definition of inertial frames and/or a statement that such frames exist. This is clearly a modern overlay. ...
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### An example of an inertial frame in which Newton's second law does not hold?

Suppose that some frame satisfies Newton's second law, so that $F_{net} = ma$ for all particles in the frame. Does this imply that the frame satisfies Newton's first law? This seems to be the case, ...
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### Is Newton's first law a special case of a more general law?

I was reading my freshman physics textbook (fundamental's of physics by Jearl Walker), and the book says that Newton's first law only applies in a special frame of reference Newton’s first law is not ...
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### What are the most fundamental laws of Newtonian Physics? [closed]

By fundamental, I mean, those laws which if assumed could be used to prove all other laws and provide the essence of the complete picture. I am a high school student, while learning physics I came ...
Can Newton's first law of motion be considered merely as a special case of second law of motion with $a=0$? If so, the first law really needed? Why does the acceleration of a freely falling body not ...