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2015-10-24T16:00:21+05:30

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NEWTONS'S LAW OF GRAVITATION. all bodies in this universe attract each other with a force that is directly proportioned to the product of their masses and inversely proportioned to the distance of their square 
moon moves around the earth due a centripetal force supplied by gravitational force between earth and moon

according to keplers's second law,the line joining plaet and the sun sweeps out eqaul area in equal time
according to keplers's thirds law,cube of mean distance r of the plaet from the su is proportional to the sqaure of its orbit
according to ewtons law of gravitation
Now, Law of Gravitation also states that force of attraction by which an object attracts other object is inversely proportional to the square of distance between them.Now from equation (i) and (ii) we get
here G is a constant and called universal consant of gravitation,its value is 6.673*10raise to the power-11 Nm²kg-²
acceralation due to gravity is greator at poles than the eqauter
The earth attracts objects towards it due to gravitational force. When an object falls towards the earth due to the earth’s gravitational force it is called free fall.
 When an object falls towards the earth there is a change in its acceleration due to the gravitational force of the earth. So this acceleration is called acceleration due to gravity.
The acceleration due to gravity is denoted by g.
The unit of g  is same as the unit of acceleration  ms -2 From the second law of motion, force is the product of mass and acceleration.      F = ma For free fall, force is the product of mass and acceleration due to gravity.                         F = mg    mg = G  M x m/d2  g = G m/d2 
where M is the mass of the earth and d is the distance between the object and the earth.
For objects near or on the surface of the earth d is equal to the radius of the earth R    mg = G M x m/ R2     or  g =  G M/ R2The value of  g is  9.8 ms -2
The mass of a body is the measure of its inertia. If the mass of a body is more its inertia is more.    The mass of a body is constant and does not change from place to place.    The SI unit of mass is kg.
The weight of an object on the earth is the force with which the earth attracts the object and the weight of an object on the moon is the force with which the moon attracts the object.
The mass of the moon is less than the mass of the earth. So the moon exerts lesser force on the objects than the earth.
 The weight of an object on the moon is one sixth (1/6th) of its weight on the earth
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thank you my dear
I amsorry if was a bit rude to u.
no its fine but if it helped plzz mark as the brainliest.. :)
I am sorry i cant your answer as the brainliest it can only be marked by the person who asked the question.
But I can say thanks to you.
2015-10-24T16:18:45+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Every objects in the universe attracts every other object with a force which is called the force of gravitation.
Gravitation is one of the four classes of interactions found in nature.These are:-
(1)the gravitational force
(2)the electromagnetic force
(3)the strong nuclear force
(4)the weak nuclear force
Although of negligible importance in the intractions of elementry particles,gravity is of primary importance in the interactions of objects.It is gravity that holds the universe together.According to the newton's law of gravitation,gravitational force is the attractive force between two masses m1 and m2 separated by the distance r.
Gravitational force where G is the universal gravitational constant.The value of G is 6.67 x 10 to the power -11.
some important points about gravitational force are:-
(1)gravitational force is the central as well as conservative force.
(2)It is the weakest force in nature.
(3)It is 1036 times smaller than electrostatic force.
(4)The law of gravitational is applicable for all bobies,irrespective of there size,shape and position.
(5)gravitational pull of earth is called gravity.
(6)It s conservative in nature.
(7)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.
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