Lift
A drawing of an airplane in flight with the wings outlined in yellow

The wings of an airplane help create the lift that keeps it in the air. Image Credit: NASA

      the upward force that keeps an aircraft in flight. Lift is created by the aircraft's wings moving through the air.



Sentences:
Lift is the force that holds an aircraft in the air.

An airplane must have enough lift so gravity cannot pull it down.



More Information:
http://www.nasa.gov/audience/forstudents/k-4/stories/what-is-aerodynamics-k4.html
http://ksnn.larc.nasa.gov/webtext.cfm?unit=plane   →
http://www.ueet.nasa.gov/StudentSite/dynamicsofflight.html   →