Georgia Department of Education
Ga Virtual Learning: Special Relativity and Quantum Mechanics
In this interactive tutorial students explore special relativity and quantum mechanics. Learn basic tenets of the theory of special relativity and the relationship between mass and energy. Also discover the evidence for the particle...
OpenStax
Open Stax: Fictitious Forces and Non Inertial Frames: The Coriolis Force
In the following interactive students will begin to discuss the inertial frame of reference and the non-inertial frame of reference. They will also describe the effects of the Coriolis force.
Wikimedia
Wikipedia: Centripetal Force
Wikipedia's site on centripetal force provides a section explaining the difference between centripetal force and centrifugal force. Includes formulas and hyperlinked terms.
Other
No Carolina St Univ: The Day the Universe Went All Funny
This site provides a very readable treatment of a really difficult subject. You still have to work hard at it, but this article can make relativity understandable.