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Thrust, lift, drag, and weight are the four forces acting on an airplane. Each force is described and explained. The last paragraph has a link to a short movie explaining how the four forces affect the flight of an aircraft. Lesson links at the bottom of the page are for K-6, 6-8, and 9-12 grade levels.
http://www.grc.nasa.gov/WWW/K-12/airplane/forces.html
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What Are Forces?
Pushing and pulling are forces. Go to these web pages to learn more about forces. Try some of the ideas yourself.
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