Question

What is Newton's law of gravitation? Define $G$.

Answer 1

Newton's law of gravitation:

1. According to this, the force of attraction between any two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
2. Mathematically, let ${\mathrm{m}}_1$and ${\mathrm{m}}_2$ be the masses of two massive bodies separated by distance ‘’$\mathrm{r}$‘’, then the force of attraction is given by-

$\mathrm{F}=\mathrm{G}\frac{{\mathrm{m}}_1{\mathrm{m}}_2}{{\mathrm{r}}^2}$, where $G$ is gravitational constant.

Gravitational constant $G$:

1. It is constant which relates the force of attraction between two bodies to their masses and the distance between them.
2. Its value is constant everywhere and is $6.67\times {10}^{-11}\mathrm{N}{\mathrm{m}}^2{\mathrm{Kg}}^{-2}$.