![Image of Spacecraft Structures Design Challenge cover](https://webarchive.library.unt.edu/web/20090807170859im_/http://www.free.ed.gov/images/resources/design.jpg)
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![Example from electrostatics Midterm Examination (N=95). Consider a region of space where there is an electric field given by the equation.](https://webarchive.library.unt.edu/web/20090807170859im_/http://www.free.ed.gov/images/resources/act-based.jpg)
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Activity-Based Physics presents "thinking problems" for physics topics: vectors, kinematics, momentum, circular...
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![Six Elephant on Triangle. The triangle is still standing because the pulling force in the bottom side is balancing the pushing forces in the upper sides.](https://webarchive.library.unt.edu/web/20090807170859im_/http://www.free.ed.gov/images/resources/building-labs.jpg)
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Building Big Labs helps kids think about structures they see every day and the impact of technology on...
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![In fusion, two lighter hydrogen nuclei combine to form a single, somewhat larger helium nucleus.](https://webarchive.library.unt.edu/web/20090807170859im_/http://www.free.ed.gov/images/resources/engineering-td.jpg)
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Engineering provides video clips and interactive resources for learning about the design process...
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