UNIVERSAL LAW OF GRAVITATION OR NEWTON'S SECOND LAW OF GRAVITATION
According to the law, every object in the universe attracts every other object in the universe with the force which is proportional to the product of their masses and inversely proportional to the square of the distance between them.
The force is directly proportional to the product of their masses, i.e, F â m1 x m2.
F = (G x m1 x m2) / d²
where F is the force, G is the universal constant for gravity, m1 and m2 are the masses, and d is the distance.
IMPORTANCE OF THE LAW
It successfully explained several phenomena which were believed to be unconnected
The force that binds us to the Earth
The motion of moon around the sun
The tides due to moon and sun
The motion of planets around the sun
Rainfall and Snowfall due to this force
Atmosphere of earth is possible due to this.
The prediction of solar and lunar eclipse.
Galileo concluded that the bodies having different masses dropped simultaneously hit the ground at the same time if air resistance is neglected.
g
acceleration due to gravity
acceleration produced in a body freely falling under the actions of gravitational pull of the earth
the value of g is different at diff points of the earth
it decreases as we go higher from surface
G
universal gravitational constant
G is the gravitational force between 2 objects of unit masses seperated by unit distance
the value of G is 6.7 x 10šš Nm² / km²
The value of G does not change with jeight or depth
MASS AND WEIGHT
Mass is the quantity of matter contained in an object. The mass of an object is constant an dir is the measure of its inertia. It can never be zero.
Weight is the force with which the earth attracts an object. It is measured in Newton and it can be zero at the centre of earth. It is a variable and vector quantity.
Sorry for typos !!
