lwheng/pc1221formula — pull request #1 by ngzhian (2012-09-12 02:07:11+00:00)
Title: HELLO LOW WEE!

Hi I modified some parts (see commit message below =] ), and will spend more time going through and contributing maybe after school today when I revise for the MCQ :) Thanks for your awesome effort!

The Atomic mass part is unclear because I believe the something x 10 ^ -27 is the mass of a proton and not an atom, but I need some time to verify, and also that value is not correct according to various websites I have consulted, including wikipedia. Need more time to verify it, but I've just changed it anyway.

I edited various subsubsections under Lect 9-10 including:
- adding alt def for Newton's First Law
- adding more juice to definition of Sigma F
- rearranged definition of Newton's Third Law
- added in the Forces of Friction part