Question

three laws of newton???

Answer 1

1 law. An object to be in a state of rest or of uniform motion along a straight line unless acted upon by an unbalanced force
2 law. the rate of change of momentum of an object is proportional to applied unbalanced force in the direction of the force
3law. to every action, there is an equal and opposite reaction

Answer 2

$\huge\textbf{Newton's Law of Motion :}$
=====================================

$\textbf{1) Law of Inertia :}$

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.

==================================

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

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,

$\textbf{F = ma}$

===================================

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

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 !!]

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

===================================