Earth's Gravitational Force
The force which earth exerts on a body is called 'force of gravity'. i.e.
Where M = mass of the earth, R = radius of the earth.
Due to this force, a body released from some height on the earth's surface falls towards the earth with its velocity increasing at a constant rate. Acceleration due to Gravity :
The acceleration produced in a body due to attraction of earth is called the acceleration due to gravity and is denoted by 'g'.
near the earth surface g on moon ≈
A body moving upwards with some initial velocity, experiences a retardation of 9.8 m/s2
& its velocity decreases continuously unless it becomes zero.
After this, it again starts falling towards the earth with the same acceleration of 9.8 m/s2
The value of g is minimum at equator and maximum at poles.
The value of g does not depend upon the mass of the body falling towards the earth.