get cracking vs get going

get cracking and get going both are verbs.

Word	Noun	Adjective	Verb	Adverb
get cracking	No	No	Yes	No
get going	No	No	Yes	No

As verbs, get cracking and get going are synonyms defined as:

Other synonyms of get cracking include bestir oneself, get moving, get rolling, get started, get weaving.

get cracking (verb)	get going (verb)
start to be active	start to be active
	begin or set in motion