The value of the gravitational constant $(G)$ depends upon:

The acceleration due to gravity on the surface of the Earth is:

The force of attraction between two unit point masses separated by a unit distance is called

Give reasons:
$(i)$ What is meant by acceleration due to gravity?
$(ii)$ The value of $g$ is not constant on the surface of the Earth.
$(iii)$ Objects of different masses take the same time to fall from a fixed height.
$(iv)$ $G$ is known as the universal gravitational constant. Write its $SI$ unit.

State the source of centripetal force that our earth requires to revolve around the sun. List the factors on which this force depends.

Give a reason for the statement that the value of $g$ is greater at the poles than at the equator.