Well - I have always thought it is better to try to raise the level of understanding when it comes to models and aerodynamics than to lower the level. The forum is called "Aerodynamics" after all. I have a badly bent heart (7 bypass total, valves, etc. ) and when I have a question about heart health I don't want an answer like - well it just beats you know!

It is OK to give a good answer and then if necessary move the level of science up or down until understanding is arrived at.

"lift is porportional to the square of the air velocity"

The example given in the figures several answers above is terrific in it's simplicity. It is only a little bit of math. It won't hurt. The lift equation is

L = .5 * Cl * r * V^2 * A

L = total wing lift
Cl = wing lift coefficient
r = air density
V = air velocity
A = wing area

So write it as

L is proportional to V^2 or....

the lift of a wing is proportional to the square of the air velocity (relative to the wing).

When you go twice as fast you get four times the lift out of the wing.

Ben