Question

Explain what is meant by the eq. g=G×M/R sq. 2

Answer 1

is means that the gravit varies with radius and mass

Answer 2

The above is an equation for acceleration due to gravity (g). It gives the relation between 'g' and Gravitational constant (G), Mass of object (M) and radius of object(R).

Acceleration due to gravity is directly proportional to mass of the body, and inversly proportional to the square of the radius of the body.

G or univeral gravitational constant is the proportionality constant.

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F=Gm1m2/r^2…1

Where G is the gravitational constant

Also..accordin to mewton’s second law

F=m1a…..2

Equating ..1 and..2

Gm1m2/r^2=m1a

So the value of gravitational acceleration is given by

a=Gm/r^2

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It's the basic equation for acceleration due to gravity. It means the acceleration doesn't depend upon the object in concern i.e. a heavy object as well as a light object falls with same acceleration. I also increases with decreasing distance between the object in concern.