How+does+an+airplane+fly?+Part+2

**__By: Julian S __**
 * __How Airplanes Fly __**

Airplanes are heavier then air so they have to have characteristics of aerodynamics. Airplanes have 3 features, a long narrow body called a fuselage, wings that extend from either side of the fuselage, and a tail. Airplanes fly because of the shape of their wings. The shape of the plane’s wings is called a airfoil. It’s a flat bottom with a curved top. When air flows over the top of the wing, it causes low pressure, which causes lift. When air flows across the bottom of the wing it also causes low pressure which causes more lift.
 * __Basic idea of flight __**

There are four forces that are associated with the flight of an airplane. Those are lift, weight thrust and drag.

The faster the airplanes fly’s the more lift. At higher speeds the air travels faster around the wing. Decreasing the high pressure around the top surface and increasing low pressure on the bottom surface.


 * __ Helping Factors in Flight __**

Many airplanes need propellers to help get the air that planes need to fly. There are also other ways to get that air, like jet engines, and some are still powered by rockets. All airplanes have sections on their wings called control surfaces. In the middle of the airplane there is something called a control stick. Which is used to move little parts on the back of the wings and tail to change direction to fly in different directions.

__ Angle of attack __ The angle of attack is very important because the plane would not fly upwards without it. The angle of attack is the angle that the plane is pointed up. If there was no angle of attack the plane would not lift up into the sky.






 * //__Glossary __//**

__Fuselage __: The body of an airplane.

__Aerodynamics __<span style="color: #595959; font-family: 'Calibri','sans-serif';">: a branch of dynamics that deals with the motion of air and other gaseous fluids and with the forces acting on bodies in motion relative to such fluids.

__<span style="color: #595959; font-family: 'Calibri','sans-serif';">Airfoil __<span style="color: #595959; font-family: 'Calibri','sans-serif';">: <span class="ssens2" style="color: #555555; font-family: 'Verdana','sans-serif'; font-size: 12px;">a body (as an airplane wing or propeller blade) designed to provide a desired reaction force when in motion relative to the surrounding air.

Citations; //<span style="font-family: 'Trebuchet MS','sans-serif'; font-size: 11.3333px;">How Do Airplanes Work? //<span style="font-family: 'Trebuchet MS','sans-serif'; font-size: 11.3333px;">. Prod. The Entertainment Group. The Entertainment Group, 2004. //Discovery Education//. Web. 22 September 2011. <http://www.discoveryeducation.com/>. <span style="font-family: 'Trebuchet MS','sans-serif'; font-size: 10px;"> Encyclopædia Britannica, Inc., 2011. Web. 22 Sept. 2011. <span style="font-family: 'Trebuchet MS','sans-serif'; font-size: 10px;"> < [] >.
 * <span style="font-family: 'Trebuchet MS','sans-serif'; font-size: 10px;">airplane. **<span style="font-family: 'Trebuchet MS','sans-serif'; font-size: 10px;">" //Compton's by Britannica//. //Encyclopædia Britannica Online School Edition//.