Ques. How can the first law of motion be mathematically started from the second law of motion.

Dear Student,

By Newton's second law of motion, we know that t
he acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object.
i.e, F= m x a
Now let F=0, it means that the product of mass and acceleration must be zero i.e, m x a = 0.
Since mass can never be zero, it means that the acceleration must be zero for the equation to come true.
Hence a=0, which means if no force exerts on an object then no acceleration is produced. This is what we called Newton's first law.


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F = ma
a = v-u/t

F = m x v-u/t

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