Gravity & Gravitational Force
Gravity is the property by virtue of which any physical body attracts the other body. The force that attracts a body towards the center of any body having mass is called as gravitational force.
Gravitational force is not just the attraction force between an object and Earth but its attraction that exists in all objects having mass. The degree of intensity is measured by acceleration caused in the body under the influence of gravity which is represented by g.
The value of g is constant for every planet. For Earth value of g is 9.8 m/s2.
Newton gave the gravitational law according to which the Gravitational force between two bodies is directly proportional to the product of masses and inversely proportional to square of distance between them.
F ά m1 m2
F ά 1/r2
The more the mass the more is the gravitational force between the bodies and the more is the distance between the bodies less is the gravitational force. Combining the equation:
F= Gm1m2/r2 Where G is gravitational constant. Its value is 6.6726m3kg-1s-2
Importance of Gravity:
It shapes the structure of entire universe.
Its law describes the trajectories of objects in the solar system.
It describes the motion of all objects on Earth.
It causes formation of tides.