This site discusses what the equivalence principle is and an experiment that demonstrates its validity. There are mnay helpful diagrams accompanying this tutorial.
<a href="http://www.compadre.org/astronomy/items/detail.cfm?ID=1234">European Space Agency. The Equivalence Principle: True or False?. Paris: European Space Agency.</a>
The Equivalence Principle: True or False?. (n.d.). Retrieved June 19, 2013, from European Space Agency: http://users.skynet.be/Equimass/Principeuk.html
European Space Agency. The Equivalence Principle: True or False?. Paris: European Space Agency. http://users.skynet.be/Equimass/Principeuk.html (accessed 19 June 2013).
%0 Electronic Source %T The Equivalence Principle: True or False? %I European Space Agency %V 2013 %N 19 June 2013 %9 text/html %U http://users.skynet.be/Equimass/Principeuk.html
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