Newton’s laws of motion -- Does the 1st Law presuppose the 2nd Law?

[feesicksman]

Homework Statement

Is Newton‘s first law of motion necessary supposing that we already know that Newton‘s second law of motion is valid?

Relevant Equations

None

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[kuruman]

Is this a homework question? If so, tell us what you think before you can receive help.

 

[PeroK]

Homework Statement: Is Newton‘s first law of motion necessary supposing that we already know that Newton‘s second law of motion is valid?

Good question!

 

[kuruman]

Consider a mass at the end of a string moving in a circle at constant speed on a horizontal frictionless plane. At some point the string is cut. After the string is cut, the second law says$$0 = 0$$ which is not very useful for describing the motion of the mass.