How did the airplane effect the 1920's politically?
It allowed for world leaders and other such important political figures to obviously move from one place to another for meetings ect. and it also revolutionized the trade world.
The gravitational force between the Earth and an airplane is greatest when the airplane is at the minimum possible altitude. Its effect on the airplane depends on how the gravitational force is related to the total system of forces on the aircraft, that is, what other forces are acting on it at the same time, whether it's climbing, diving, standing still on level ground, standing on sloped ground in a wind, etc.