Is plucking a guitar string a compression force?

No, plucking a guitar string is not a compression force; it is a tension force. When you pluck a string, you pull it away from its resting position, creating tension within the string. When released, this tension causes the string to vibrate, producing sound. Compression forces, on the other hand, involve pushing or squeezing materials together, which is not the case when plucking a string.