Question
Wed November 30, 2011 By:

Why do airplane does not fall to the earth due to earth's gravitation.

Expert Reply
Thu December 01, 2011
from  bernoulli's theorem we know that,
if the speed of fluid is more in one part of the flow, pressure there will be less,if we consider the height of the all segments  of flow are same.
so  as the aeroplane moves with great speed, the air layer above the plane and below the plane moves along the surface.
the speed of air above the plane will be more than the surfce below due to the special shape of the plane.
so the pressure above the plane will be less than below.
so there acts an upward pressure which resists the plane from falling.
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