Magnetism 7
http://www.youtube.com/watch?v=l3hw0twZSCc Uploaded on Aug 2, 2008 Learn more: http://www.khanacademy.org/video?v=l3hw0twZSCcThe magnetic force that two current-carrying wires exert on each other.
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Physical Science
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Gravity for Astronauts in Orbit
http://www.youtube.com/watch?v=oIZV-ixRTcY Uploaded on Jun 12, 2011 Learn more: http://www.khanacademy.org/video?v=oIZV-ixRTcYWhy do astronauts appear weightless despite being near the Earth?
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