Is acceleration due to gravity constant?

Answer 1

Yes, but you don't experience it around here.

The part of acceleration that's due to gravity is constant, but anything that falls

through air experiences an increasing air-resistance force as it falls faster, and

it eventually stops accelerating, at a speed called its "terminal velocity".

If you rig up a situation where there's no air, and you can witness the pure effects

of gravity, then things really get interesting ... like a Bowling ball and a feather both

falling together and hitting the bottom at the same time. Many museums have exhibits

like that set up, with a large transparent shaft from which the air us evacuated, and

in which they drop things.

No. acceleration due to gravity depends upon i) height above the earth's surface ii) depth below the earth's surface iii) rotation of the earth iv) shape of the earth. it decreases with the height above the earth's surface:it decreases with the depth below the earth surface, it decreases with the speed of the rotation. it is zero at the centre of the earth.