Question

Why the object like aeroplane ,helicopter ,birds and those things that fly in the sky not attract by gravitational force?

Answer 1

Dear student,

It's a misconception that flying birds are not pulled by earths gravity.Every object on Earth is influenced by gravity. Even the Earth is influenced by the Sun's gravity. So, if birds fly, they are doing so despite the gravitational pull through their aerofoil structure( the cross-sectional shape of a wing).

There are differences in velocity on the upper and lower side of aerofoil. This creates pressure differences i.e. the lower side gets more pressure and the upper side gets lesser pressure which lifts up the bird. The movement of wings creates the thrust to enable a bird to move forward. Thus, birds overcome gravity and gain height.

Aeroplane also uses these concepts.So every object on Earth is influenced by gravity

Hope you understood

Regards