by Dr. Walter Fendt, Augsburg, Germany.

http://www.walter-fendt.de/ph14e/
physengl/buoyforce.htm

Lower blocks of various densities into a fluid whose density you control. The force necessary to support the block while lowering it is shown. A nice simulation lab for Archimedes' Principle.

Dr. Fendt has a collection of physics applets on his site.

NASA ALLSTAR Network Consortium.

http://www.allstar.fiu.edu/Default.htm

A site dedicated to the instruction of flight-related history and the physical principles of flight. The Principles of Aeronautics sections include diagrams, activities and Macromedia animations of all physical principles of flight including airfoils, propellers, Bernouilli's Principle, control surfaces and paper airplanes, navigation, meteorology, propulsion, Charles' and Boyles' Laws, and more.

by NASA Langley Research Center.

http://observe.arc.nasa.gov/nasa/aero
/tunnel/tunnel_main.html

Wind tunnels play a major role in the design and development of virtually all aircraft flying today. Come take a tour and learn about their origins and how they work.

Here are two other sites containing wind tunnel simulations. The first is the The Java Virtual Wind Tunnel by David Y. Oh at the Computational Aerospace Sciences Laboratory, MIT and Wind Tunnels by SWE for K-12 education.

Online exhibition at the NASA ALLSTAR Network Consortium.

http://www.fi.edu/biosci
/heart.html

A site devoted to the most important pump and fluid in your life. The structure and development of the heart as well as cardiac health are presented at length. A killer reference site, the medweb cardiology site is referenced here.

by NASA Glenn Research Center .

www.grc.nasa.gov
/WWW/K-12/airplane/bga.html

An introduction to aerodynamics which covers a just about everything including a simulation SimFoil where you can investigate how an aircraft wing produces lift including the object, the motion and the air..

by Open Teach Group .

http://www.openteach.com
/javaapplets/Bernoulli.html

This is a basic simulation demonstrating Bernoulli's Equation where you can change the diameters of tubes and observe the changes in pressure and in flow rate. Open Teach has a collection of applets for math and science.