Question

laws of newton............

Answer 1

Hey !!

Newton's first law :-

Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

Newton's second law :-
The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

Newton's third law :-
It states that 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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