lift on a plane?

Question

please i need some help quickly ! by the end of today .
does the air on the top of the wing go faster then the air under the wing ? or can you just tell about lift on a plane something i would understand at myage (14). as we have to show the class 2moro. :(:(:(

Answer 1

Roughly when the fluid velocity is low, the pressure is high. And vice versa. So for lift to occur there must be a higher pressure below hte wing thus the velocity below the wing is lower.

Answer 2

Understand the plane will only take off the ground when it reaches a certain speed. That speed will depend on it's wing sizes and it's over all weight.

When a plain is picking up speed and moving down the runway it is cutting it's way through the air.
The wing design is similar to the structure of birds and the sharks fins in that, the bottom of the wing is flat and the top part of the wing is more curved. So at a fast speed, the air molecules will flow over and under the wings. But the path way distance the air molecules flow will be longer over the curved part then the flat lower part. So for the same number of molecules, the upper part of the wing will experience less pressure then the lower part of the wing. This results in a force upwards on the winds.

A little experience you can try.
Run a tap (fosset) with a nice little gentle flow or water. Get a spoon and place the curve part of the spoon just barely touching the water flow. Apply no force, just hold it gently. You will find the water flow will cause the spoon to get pulled in. It's the same principle of the winds of the plane. The pressure of air is greater to the pressure of the running water and so the spoon gets pulled in.

Answer 3

The air on the top of the wing must travel a larger distance in the same amount of time, and therefore has higher velocity than the air under the wing. Air at the same temperature, etc will have a lower pressure if it is moving faster, the result is that less pressure is pushing down on the top of the wing (because the air is moving faster) than the pressure pushing up on the bottom of the wing. This produces lift.

Answer 4

To try to give you an easy "14 year old" answer to the source of the lift effect, it is a bit like the water skier staying up on the water surface. As long as he keeps moving and angles his skis a bit upward at the front he will stay up. The wings of a plane are designed to perform similarly in air (of course!) ratrher than water. The remaining explanation to get to the detail of airplane wing design is aerodynamics.

I hope that helped,

Bramble.

Answer 5

the air on the top of the plane covers a larger distance than the bottom of the plane thus having a greater speed.
this produces a pressure difference between the top and bottom (there is more pressure on bottom) which creates a net force upward

Answer 6

You're correct, as is Adam above me. Here are a few links which include diagrams:
http://www.grc.nasa.gov/WWW/K-12/airplane/lift1.html
http://travel.howstuffworks.com/airplane8.htm
http://www.esa.int/esaCP/ESAF8BG18ZC_index_3.html

I hope that helped.
Good luck!!!