[DOC] [TLE] Forces on an Airplane - Glenn Research Center - NASA [PAR] This slide shows the forces that act on an airplane in flight. ... To overcome the 
weight force, airplanes generate an opposing force called lift. ... source of power 
has to be applied to initiate the motion necessary for the wings to produce lift. [DOC] [TLE] the forces acting on the airplane in flight [PAR] The weight or force due to gravity pulls down on the plane opposing the lift 
created by air ... The special shape of the airplane wing (airfoil) is designed so 
that air flowing over it will ... on balsa wood airplanes, paper planes and others) 
also have managed to create lift. ... This is the primary result of a turbulent 
boundary layer. [DOC] [TLE] How Airplanes and Aircraft Fly - Avjobs [PAR] Airplanes fly when the movement of air across their wings creates an upward 
force ... fact and create the lift force necessary to overcome the weight of the 
aircraft, ... the minimum speed needed to keep a plane flying should an engine 
fail after the ... and inside are three primary sections: the cockpit, the cabin (which 
often is... [DOC] [TLE] Airplane Wings: How Lift is Created During Aircraft Flight and Takeoff [PAR] Nov 29, 2011 ... How do airplane wings interact with the air to create upward movement? ... Of the 
four primary forces that enable an airplane to fly, lift is... [DOC] [TLE] How Airplanes Fly - (ALLSTAR) Network [PAR] Jul 20, 2012 ... Many ask the simple question "what makes an airplane fly"? ... The primary 
advantage of this description is that it is easy to understand ... Little math is 
needed to yield an estimate of many phenomena associated with flight. .... (Why 
the wing bends the air with enough force to generate lift will be discussed in... [DOC] [TLE] Principles of flight | Sciencelearn Hub [PAR] Sep 13, 2011 ... Four main forces affect the flight abilities of birds and planes. ... to keep the wings 
moving through the air to sustain the lift necessary for flight. [DOC] [TLE] Wings and lift | Sciencelearn Hub [PAR] Sep 21, 2011 ... Home  Contexts  Science Stories  Nature of Science  Innovation  Primary 
Science  Teacher Ideas ... For a plane or bird to fly, its wings must produce 
enough lift to equal its weight. ... This shape is needed to help generate lift. ... 
Speeding up means the wings force more air downwards so lift is increased. [DOC] [TLE] Airplane - Wikipedia [PAR] An airplane or aeroplane (informally plane) is a powered, fixed-wing aircraft that 
is propelled ... Cayley was building and flying models of fixed-wing aircraft as 
early as 1803, and he built a successful ... it very easy to fly. Ten planes were 
made for the Romanian Air Force, being the second-ever military air force in the 
world. [DOC] [TLE] Theory of Flight - MIT [PAR] Likewise, man-made aircraft rely on these principles to overcome the force of 
gravity and achieve flight. ... A plane uses its wings for lift and its engines for 
thrust. Drag is ... To further understand how an airfoil creates lift, it is necessary to 
use two important equations of physical science. .... How does each generate lift? [DOC] [TLE] Fixed-wing aircraft - Wikipedia [PAR] A fixed-wing aircraft is an aircraft, such as an aeroplane, which is capable of flight 
using wings that generate lift .... This was the first controlled flight, to be officially 
recognised, by a plane able to take off under its own power .... A paraglider is a 
lightweight, free-flying, foot-launched glider aircraft with no rigid primary structure. [DOC] [TLE] KIDS: How do Airplanes Fly [PAR] Feb 23, 2010 ... This is because helicopters are 'rotary wing aircraft,' meaning that the rotor ... 
formulas needed to compute the results of these factors on an airplane in flight. ... 
Airplanes fly because they are able to generate a force called Lift... [DOC] [TLE] Forces of Flight | How Things Fly [PAR] Understanding how things fly begins by learning about the Four Forces of

Question: A plane's wings are necessary to create this primary force in flying
Answer: lift