Question

What is newtons law of motion

Answer 1

first law: an object remains in the state of rest or in the state of uniform motion in a straight unless it is compelled to change the state by an applied force.---- second law: the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force.---- thirdlaw: for every action there is an equal and opposite reaction

Answer 2

$\huge\textbf{Newton's Law of Motion..}$
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$\textbf{1) Law of Inertia :}$

It is Newton's First law.

According to it an object at rest remains at rest, an object in uniform motion remains in uniform motion until or unless external force applied on them.

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$\textbf{2) Law of Force :}$

It is Newton's Second law.

According to it the rate of change of linear momentum is directly proportional to the external force applied.

F α dp/dt 

F = k dp/dt

Now,

p (momentum) = mv

So,

F = k d(mv)/dt

F = k md(v)/dt

F = k ma

(As, dv/dt = a)

Experimentally k =1

So,

$\textbf{F = ma}$

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$\textbf{3) Action - Reaction Law :}$

It is Newton's Third Law.

According to it, for every action there is equal and opposite reaction. [Equal in Magnitude but opposite in Direction.]

[DERIVATION is in Attachment !!]

$\textbf{F12 (vector) = - F21 (vector)}$

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