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The purpose of this wiki is to provide articles on physics concepts as well as provide everyone from physics graduate students to casual readers with peer-reviewed problems and solutions. Many of these problems are graduate-level, from public problem banks. Public problem banks are often compiled by various university physics departments and include questions that they have given on previous PhD qualifying/prelim exams. The community can submit problems, search for problems, and post or correct solutions to these problems.
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Gravity is one of the four fundamental forces. It is the weakest of the four forces, yet one of the most easily observed. It causes a mutual attraction between two bodies by virtue of their masses. Gravitational force is believed to be caused by the exchange of yet to be discovered particles called gravitons. Read More