This site by physicist StanislavSykoraaim provides free online texts, theses, and course materials on the subjects of magnetic resonance (MR), magnetic resonance imaging (MRI), nuclear-magnetic resonance (NMR) and other related topics. 


These fun and compelling physics questions are offered up by the University of Maryland's Department of Physics. There are about 300 questions available on the site. The answers to each problem are complemented in many instances with photographs and short videos.


This physics teaching resource sites from University of Minnesota's Physics Education Research Group is a rich source for resources on linear kinematics problems, force problems, conservation problems and others.


The Physics Education Technology (PhET) site features many well-designed and engaging physics and chemistry simulations for use in the classroom. It also offers fifteen simulations, which cover projectile motion, salts & solubility, wave interference, and other related areas.


Access to this site is provided by the physics department at North Carolina State University. This list of online physics demonstration manualscontains 28 online demonstration manuals as well as demonstrations bibliography that contains over 7500 references.


This site by The American Institute of Physics has a large collection of educational materials and resources designed for physics undergraduate majors, instructors, and those thinking about a career in physics. 


This is an Open Access to e-prints in Physics, Mathematics, Computer Science, Quantitative Biology, Quantitative Finance and Statistics.