what is first gravitational law of Newton
Answers
Explanation:
Newton’s Law of Gravitation
Gravitational force is a attractive force between two masses m1 and m2 separated by a distance r.
The gravitational force acting between two point objects is proportional to the product of their masses and inversely proportional to the square of the distance between them.
where G is universal gravitational constant.
The value of G is 6.67 X 10-11 Nm2 kg-2 and is same throughout the universe.
The value of G is independent of the nature and size of the bodies well as the nature of the medium between them.
Dimensional formula of Gis [M-1L3T-2].
Important Points about Gravitation Force
(i) Gravitational force is a central as well as conservative force.
(ii) It is the weakest force in nature.
(iii) It is 1036 times smaller than electrostatic force and 10’l8times smaller than nuclear force.
(iv) The law of gravitational is applicable for all bodies, irrespective of their size, shape and position.
(v) Gravitational force acting between sun and planet provide it centripetal force for orbital motion.
(vi) Gravitational pull of the earth is called gravity.
(vii) Newton’s third law of motion holds good for the force of gravitation. It means the gravitation forces between two bodies are action-reaction pairs.
Following three points are important regarding the gravitational force
(i) Unlike the electrostatic force, it is independent of the medium between the particles.
(ii) It is conservative in nature.
(iii) It expresses the force between two point masses (of negligible volume). However, for external points of spherical bodies the whole mass can be assumed to be concentrated at its centre of mass.
Note Newton’s law of gravitation holde goods for object lying at uery large distances and also at very short distances. It fails when the distance between the objects is less than 10-9 m i.e., of the order of intermolecular distances
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