Lift is the force generated

by the way that the forward

movement created by the

thrust causes air to rush

over the wings. The air

particles passing over the

upper, curved surface of the

wing have further to go than

those passing over the flat

underside of the wing. This

means that the particles

above the wing are spaced

further out, creating lower

air pressure above the wing

than below, pushing the

wing upwards.

Drag

Drag is air resistance, even

more of a problem when

trying to fly than it was

when I was trying to break

the cycle speed record.

Every part of the aircraft

that is exposed to the air

suffers from friction with

the air particles pushing

against them or passing

over them, causing drag

to work against thrust.