# 9th Class Science Gravitation Universal Law of Gravitation

Universal Law of Gravitation

Category : 9th Class

### Universal Law of Gravitation

According to universal law of gravitation, every two object in this universe attracts each other with a force, which is directly proportional to the product of their masses and inversely proportional to the square of distance between them. Let us consider two object of mass ${{M}_{1}}$ and ${{M}_{2}}$ and d be the distance between their centre. If F be the force between the two object, then

$F\,\alpha {{M}_{1}}\times {{M}_{2}}$ and $F\,\alpha \,\frac{1}{{{d}^{2}}}$

Combining the above two equation we get,

$F\,\alpha \,\frac{{{M}_{1}}\times {{M}_{2}}}{{{d}^{2}}}$

Or,          $F=G\,\frac{{{M}_{1}}\times {{M}_{2}}}{{{d}^{2}}}$

Where, G is universal gravitational constant.

The value of G is found to be $\mathbf{6}\mathbf{.67\times 1}{{\mathbf{0}}^{\mathbf{-11}}}\mathbf{N}{{\mathbf{m}}^{\mathbf{2}}}\mathbf{/k}{{\mathbf{g}}^{\mathbf{2}}}$. The value of G is called universal constant i.e. it remains same everywhere in this universe. It does not depend on anything. It is applicable for all particle whether small or large.

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