Question

Question :- Explain Newton's Laws of Motion in brief.
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Answer 1

$\huge{ \blue{ \mathscr{ \underline{A \bf{nswer} ... \quad}}}}$

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✫★Newton's First Law Of Motion :-

According to Newton's first law of motion If a body is at the position of Rest will remain at rest and if a body is in motion will remain in motion in a streight line with uniform speed, unless it is compelled by an external force to change its state of rest or of uniform motion.

This Law is known as law of inertia.

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✫★Newton's Second Law Of Motion:-

According to Newton's second law of motion The rate of change of momentum of a body is directly proportional to the applied force acts.

$\bf \red{force\propto \: \frac{ \quad \: change \: in \: momentum \quad}{time \: taken} }$

$\bf \red{force\propto \: \frac{ \quad \: mv - mu\quad}{t} }$

$\bf \red{force\propto \: \frac{ \quad \: m(v - u)\quad}{t} }$

$\bf \red{force\propto\:m \times a} \bf \quad \{a = \frac{v - u}{t} \}$

$\bf \red{force=k\times m \times a}$

• putting k = 1

$\boxed{ \bf \blue{force = m a} }$

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✫★Newton's Third Law Of Motion:-

According to Newton's third law of motion whenever a body exerts a force on another body, then the second body exerts an equal and opposite force on the first body.

$\quad \quad \green{\large\bf Action = Reaction}$

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Answer 2

$\bf\underline\red{Newton's \: \: Laws \: \: of \: \: Motion}$

There are 3 Laws Of Motion :-

• Newton's First Law Of Motion.

• Newton's Second Law Of Motion.

• Newton's Third Law Of Motion.

$\sf\pink{Newton's \: \: first \: \: law \: \: of \: \: Motion\dashrightarrow }$

This law states that 'An object remains in a state of rest or in a uniform motion in a straight line unless compelled to change that state by an applied force.'

This Law Is Called "Law of Inertia" because Inertia is the natural tendency of objects that remain in a state of rest or in uniform Motion.

Inertia is of 3 types :-

1. Inertia Of Rest
2. Inertia Of Motion
3. Inertia Of Direction

$\sf\pink{Newton's \: \: Second\: \: law \: \: of \: \: Motion\dashrightarrow }$

This Law States that 'A force applied on any object is directly proportional to the rate of change of momentum.'

F ∝ dp/dt

dp = Change In Momentum

dt = Change In Time

So, F ∝ Change In Momentum/Time

F ∝ mv - mu/t

F ∝ m(v - u)/t {v - u/t = a}

F ∝ma

Let k be a constant.

F = kma (k = 1).

F = ma

So, We Got A Formula,

Force = Mass × Acceleration.

$\sf\pink{Newton's \: \: Third\: \: law \: \: of \: \: Motion\dashrightarrow }$

This Law States That 'To Every Reaction, There Is an Equal And Opposite Reaction.'

$F_AB \: = \: - F_BA$

In This Law, Action and Reaction are Equal but act on different bodies. Hence, They Do Not Cancel Each Other.

This Law Is Applicable In :-

• Walking Of A Person.
• Swimming
• Recoiling Of Gun.