My definition of flight is when a craft uses the air to stay aloft for more than a short amount of time and also can move through the air. (So basically something that flies is like a bird, it may not have the same shape of design principals but it can still stay airborne).
The four forces of flight are lift, drag, gravity, and thrust. Lift keeps the plane up in the air, drag allows the plane to turn but also slows down the plane, gravity pulls the plane back down to earth, and trust propels the plane forward and helps create lift.
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