CHAPTER-10 GRAVITATION Universal law of gravitation Every object is the universe attracts every – other object with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres. The direction of the force is along the line joining the centres of two objects. Suppose two objects having masses m1 and m2 are at r distance, then the force between both will F m1 m2 ᵅ 1 F --------- ᵅ r2 m1 m2 or F -------------- ᵅ r2 or Where G is a constant of proportionality and called universal gravitational constant. Unit and Values of Gravitational constant (G) As we know , G m1 m2 F = -------------- r2 F x r2 n. m2 so G= -------------- = -------- m1m2 kg2 So SI unit of G is Value of G is 6.67 x 10-11 Nm2/kg 2
CHAPTER-10 GRAVITATION Universal law of gravitation – Every object is the universe attracts every other object with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres. The direction of the force is along the line joining the centres of two objects. Suppose two objects having masses m1 and m2 are at r distance, then the force between both will F ᵅ m1 m2 1 F ᵅ --------- r2 m1 m2 or F ᵅ -------------- r2 or Where G is a constant of proportionality and called universal gravitational constant. Unit and Values of Gravitational constant (G) As we know , G m1 m2 F = -------------- r2 F x r2 n. m2 so G= -------------- = -------- m1m2 kg2 So SI unit of G is Value of G is 6.67 x 10-11 Nm2/kg 2
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