The Feynman Lectures on Physics
A famous series of lectures, given by Richard Feynman at Caltech and kindly made available online.
mainly mechanics, radiation, and heat
mainly electromagnetism and matter
quantum mechanics
physics
Space and Time: Inertial Frames
Stanford Encyclopedia of Philosophy
Space and Time: Inertial Frames
First published Sat Mar 30, 2002; substantive revision Wed Nov 4, 2009
This is a fascinating review of the concept and history of inertial frames, from Galileo to Einstein. More about inertial frames of reference
Locked Moon 