While responding to a friend’s message, I stumbled upon the word backwards, I am used to say moving backwards, but why with an ‘s’. So, I searched the word on google and this is what I got.
-Both backward and backwards are correct, but most sources say that when you’re using the word as an adverb, backward is standard in American English and backwards is standard in British English.-
To read more go to
http://www.quickanddirtytips.com/education/grammar/backward-versus-backwards