Resources

http://www.doestimeexist.info/what_is_motion.htm
http://en.wikipedia.org/wiki/Motion_%28physics%29
http://www.qrg.northwestern.edu/projects/vss/docs/space-environment/1-what-is-gravity.html
http://theory.caltech.edu/people/patricia/gravtop.html
http://en.wikipedia.org/wiki/Feather
http://en.wikipedia.org/wiki/Quarter_(United_States_coin)