NASA
Nasa: Shuttle Reference
This site from NASA goes into great detail about the physical makeup of the Space Shuttle, and includes sidebars with further information about NASA and the manned space program.
CK-12 Foundation
Ck 12: Episd: Inertial Frames and Relative Motion
[Free Registration/Login may be required to access all resource tools.] Relative motion is always measured with a frame of reference. Evaluate a variety of frames of reference and inertial frames to understand relative motion.
CK-12 Foundation
Ck 12: Episd: Locating an Object: Distance and Displacement
[Free Registration/Login may be required to access all resource tools.] Understand how to analyze one dimensional motion by applying mathematic equations, distance, and displacement.