Everything on or near the earth is feeling the pull of gravity. Did you feel that too? When we raise our hands we feel it pull down. When we jump up, we fall. The object falls freely towards the Earth where the only force on a given is the pull of gravity. A parachutist plummets from the height, opening his parachute at the last moment, is the same sometimes said to fall freely. But it is not free-falling because of air resistance. when the steel ball-bearing is falling the air resistance is so small. In this case, we can consider it as free-falling.
Due to the force of gravity exerted by the earth, an object that falls freely near the earth’s surface travels with uniform acceleration. The value of this gravitational acceleration is 9.8 ms-2. This is written in g symbol. g = 9.8 ms-2. The direction of the g is always vertically downwards. Consider an object projected vertically upwards. A downward gravitational force acts on it.