Every object in the universe attracts other object by a force of attraction, called gravitation, which is
directly proportional to the product of masses of the objects and inversely proportional to the
square of distance between them. This is called Law of Gravitation.
(a) Write mathematical form of above law.
(b) Name any phenomenon, explained by universal law of gravitation,
(c) Write the value of 'G'.
(d) Why is 'G' called universal gravitational constant?
Answers
Answer:
Newton's law of universal gravitation is usually stated as that every particle attracts every other particle in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Since the gravitational field lines go radially inward towards the mass, the density of the field lines would be inversely proportional to the surface over which they are spread over. ... Since force is proportional to the density of field lines, the force is inversely proportional to distance squared.
What is value of G?
Its value is 9.8 m/s2 on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2. When discussing the acceleration of gravity, it was mentioned that the value of g is dependent upon location. There are slight variations in the value of g about earth's surface.
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Answer:
1. G = FMm/R²
2. The law of gravity.
3. 6.67*10^-11 Nm^2/kg^2
4. because it is constant everywhere in the universe.