Lift on a wing
Have you ever wondered how a plane can fly in the air? The first thing you need to understand is how lift is generated on the wing.
Lift is an upward force (as opposed to weight which is a downward force, exerted by gravity).
For those of you who have already played tennis or table tennis, lift can easily be seen when the ball spins in the air. This rotation given to the ball allows it to stay in the air longer.
You will see on the next page how we can explain the wing being sucked upward when the plane has reached its takeoff speed.
You will first of all need to be aware of an important thing concerning fluids :
The higher the speed of a fluid, the lower its pressure.
Then, you may understand the L and H on this chart better
This is just an introduction. If you want to know more about planes, I recommend reading these excellent pages from www.howstuffworks.com