... Physics (Greek: physis – φύσις meaning "nature") is a natural science; it is the study of matter and its motion through spacetime and all that derives from these, such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the world and universe behave. ... [full article
"good starting point to refresh your physics knowledge!" - mf
Thank you mf for bookmarking this article!