Question

according to gravity everything fall down but why does the aeroplane not fall down​

Answer 1

Answer:

First we need to know that:

Airplanes are able to fly because air moving along the wings holds them up. ... The wings are designed so that net effect is that the air pushes them upward, countering the downward pull of gravity. Large passenger planes can't fly much higher than about 12 kilometres.

Now we will know that HOW can airplanes fly.

Gravity and drag (air resistance, which is friction caused by air rubbing against the plane) try to pull the plane down and slow its speed. A plane must be built so that lift and thrust are stronger than the pull of gravity and drag by just the right amount. Lift from the wings is used to overcome the force of gravity.