Universal Law of Gravitation
* The force of attraction between any two bodies applies to all the bodies in the universe.
* The moon revolving around the earth is under the action of centripetal force.
The magnitude of gravitational force varies with the:
* Distance of the object from the earth
* Mass of the object
am =V2/Rm
* The magnitude of the earth’s gravitational force decreases with distance.
Early particle in the universe attracts other particles with a force that is :
* Directly proportional to the product of their masses.
* Inversely proportional to the square of the distance between them
F = G m1.m2/r2
* The vector addition of the gravitational forces exerted by all the particles in an extended body can be obtained using calculus.
G and g
G = 6.67259 X 10 -11 Nm2 / kg 2
g = GME/RE2