Physics (from Ancient Greek: φυσική (ἐπιστήμη) phusikḗ (epistḗmē) "knowledge of nature", from φύσις phúsis "nature") is the natural science that involves the study of matter and its motion through space and time, along with related concepts such as energy and force. One of the most fundamental scientific disciplines, the main goal of physics is to understand how the universe behaves. (wiki).
Play with (simulated) physics: http://www.algodoo.com/
Nice physics simulations: https://www.myphysicslab.com/
International Centre for Theoretical Sciences
hyperphysics, etc.
Some physics books: http://www.fisica.net/ebooks/
See DB\Cosmos, etc....
Should organize this. See SimpleMind mindmap. See also Bulk matter.