Question

What is gravitation, write the universal law of gravitation?​

Answer 1

Answer:

Gravity is measured by the acceleration that it gives to freely falling objects.

Newton's universal law of gravitation states that when two body are separated by a distance r, then both attract each other with a force which is directly proportional to the product of their masses (m1 and m2) and inversely proportional to the square of distance between them (r).

Answer 2

$\huge\sf\star$ Concept

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$\rightarrow$Every object in this universe attracts every other object with a certain force .

$\rightarrow$This force is known as gravitational force .

$\rightarrow$Magnitude of force is always same .

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Universal law of Gravitation :

$\rightarrow$ Also known as Newton's Law of Gravity .

$\rightarrow$Everybody in the universe attracts every other body with the force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them .

In simple words :

(1) Gravitation force is non contact force

(2) Always attractive in nature.

(3) Depends directly proportional to mass

(4) Inversely proportional to distance.

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G = $\color{red} {universal\: gravitational\: constant}$

$\sf\huge\implies$ F $\propto$ $\frac{1}{d²}$

$\sf\huge\implies$ F $\propto$ $\frac{M × m}{d²}$

$\: \:.$ F = G $\frac{M × m}{d²}$

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S.I unit :

$\sf\huge\implies$ F × d² = G M × m

$\sf\huge\implies$ G = $\frac{F d²}{M×m}$

$\sf\huge\implies$$\color{red} {G\:=\:Nm²\:\kg²}$

$\sf\huge\implies$ G = 6.67 × $10^{-11}$ Nm²/kg²