For example, it's the air resistance that causes a phenomenon called terminal velocity. But this happens if the object is coming from a much higher altitude. At certain point during the free fall, the downward force of gravity on the object is balanced by the force of air resistance and then there will be no net force and the object falls with a constant velocity. This is why we are not get killed when rail drops fall on our head. Rain drops are under free fall. they start from a height of about $15km$. If there are no air resistance the velocity with which it reaches our head will be about $542 m/s$. That's a speed of $1951 km/hr$. Our head will be scattered apart.