The correct answer would depend on the context of what is being said. For example, "let's have a quick chat" or "let's complete this task as quickly as possible". "Quick" is the adjective, while "quickly" is the adverb form.
Because when you need to stop quickly, It would be nice to have something bigger to step on then trying to step on an object smaller, When you need to stop quick you foot will catch the large pedal.
Quick-Drying Paint
It is a quick and easy way to figure out what you want to include in your sketch, how you want to crop it, and where you want the objects. They are also helpful because you can quickly make multiple ideas of what you want to do before you take the time to draw your final image.
quickly
In marine usage, QAWTD (generally without spaces) would be the acronym for Quick-Acting Water-Tight Door. Such doors are used on ships and submarines where the ability to quickly seal a doorway to block passage of water is required. (Follow the link for an illustration.)
Quick
Quick is an adjective. Quickly is an adverb. So you have to ask yourself what is quick? A verb or a noun? If the noun is quick, use quick. If a verb is being done quickly, then use quickly. For example: The quick dog ran. The dog is being described as quick. (dog=noun) or The dog ran quickly. The running is being done quickly. (run=verb)
The adverb form is "quickly." *In some cases, as with "fast" the word quick may appear instead of quickly, e.g "Come quick" instead of "Come quickly."
Quickly is an adverb The comparative form of quick is more quicker. The superlative form of quick is quickest.
"Quickly" is comprised of two syllables. "quick-ly"
quick
A quick asset is any asset, such as stocks and bonds, which can quickly be converted into cash.
geckos move extremely quickly!
rapid quickly :) Fast
To access something quickly?
To be fast, quick and slick when you move.
It cools quickly.