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It's a Multiphysics World The real world is multiphysics in nature. Consider your mobile phone. The antenna receives electromagnetic waves, the touch screen or buttons are mechanical and electrical components, the battery involves chemical reactions and electrical current, and so on. A single device, but multiphysics. Since it's a multiphysics world, your simulation tool must be multiphysics capable in order to correctly capture the important aspects of your design. The COMSOL Multiphysics approach starts with first principles like transport phenomena, electromagnetic field theory, and solid mechanics as the basic fibers of the software. Then, in an elegant and flexible user interface, you can weave these fibers together in a self-consistent way to solve your particular simulation needs. "COMSOL allows us to couple mechanisms in a very nice and simple way, allowing us to understand their combined effect. This is the true power of simulation." -- Dr Roberto Suarez-Rivera of Schlumberger. COMSOL Multiphysics delivers the ideal tool to build simulations that accurately replicate the important characteristics of your designs. Its unparalleled ability to include all relevant physical effects that exist in the real world is known as multiphysics.

Explain 3D has simulations explaining all kinds of machines and more. This is a 3D simulation built upon the "unity" platform, so you can move around the object in 3D. If you are teaching engineering, run a STEM lab, or work with physics, you'll want to check out what they've done on this site.

ORBITER is a free flight simulator that goes beyond the confines of Earth's atmosphere. Launch the Space Shuttle from Kennedy Space Center to deploy a satellite, rendezvous with the International Space Station or take the futuristic Delta-glider for a tour through the solar system - the choice is yours

3rd World Farmer simulation.

All sorts of science simulations

Interactive Simulations. University Of Colorado At Boulder.

good science simulations, all grade levels

A moon landing simulation that requires students to understand mass, thrust, fuel consumption, and lunar gravity. This has been used with all ages of students.

Interactive online simulations for grades 3-12

A breathtaking online space resource. Users explore the International Space Station from the outside in a realistic 3D space walk simulator. http://ictmagic.wikispaces.com/Science

Simulates the movement of objects around a mass

Celestia is a free and open source space simulator that allows you to explore space right from your computer. Celestia is available for download on Windows, Mac OS X, and even Linux. Celestia has many very cool features, including an eclipse finder. Not only does the eclipse finder allow you to find solar and lunar eclipses on Earth, but you can seek eclipses on other planets as well. I found out something really cool when checking out eclipses on Jupiter - because Jupiter is very large and has many moons, solar eclipses are very common.

Java simulations of electric circuits and electronics

"Students who are passionate gamers can talk a blue streak about the virtual online worlds where they invest their free time and energy. Usually, of course, they get to play only when they're not at school. But why not bring gaming into the classroom? Could teachers tap that same passion to spark learning?"

map simulation showing CO2 emissions birth/death rate. Turn off the sound by clicking the icon in the upper left corner

A new, free white paper-"Best Practices for Using Games & Simulations in the Classroom"-that tackles the practical challenges teachers face when they use video games was released this past February by the Software & Information Industry Association's Education Division. In this article, Lee Wilson, the author of the paper and the co-chair of the working group that produced it, summarizes, excerpts from, and describes the main points of the report.

Interesting voice simulator where you adjust the shape of the virtual mouth and voicebox to investigate how these work to produce sound.