# Newton's Law of Gravitation

• The gravitational force of attraction between two particles is directly proportional to the product of their masses and inversely proportional to the square of the distance \tt F=\frac{G\ m_{1}m_{2}}{r_{2}}
• The value of "G" is constant for any two bodies in any medium.
• Modification of space by mass particle is called gravitational field.
• Law of gravitation is a consequence of action at a distance concept.
• The relation between g and G which is used to calculate variation of 'g' is g = GM/R2
• The vector form of Newton's law of Gravitation \tt F=\frac{G\ m_{1}m_{2}}{r^{3}}\ \overrightarrow{r}
• Newtons law of gravitation is used to calculate the value of 'g'.
• Weight of a body is defined as the gravitational force with which a body is attracted towards the centre of earth.
• Universal gravitational constant may be defined as the force of attraction between two bodies of unit mass each are placed unit distance apart.
• The gravitational force between two masses is independent of intervening medium.
• Gravitational force obeys Newtons third law of motion.
• Gravitational force is conservative force.
• Gravitational forces follow principle of superposition.
• Gravitational force between bodies is independent of the presence of other bodies.
• The law of Gravitation strictly holds for point masses.

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Gravitational force, \tt F=\frac{Gm_{1}m_{2}}{r^{2}}