Right angle force on "perfectly stretched string" I have a theory which although physically impossible I would like to know some sort of answer to. Image a string stretched between two trees. The string is perfectly stretched, totally horizontal, and has no elasticity, but can bend as a normal string. My theory is that when a vertical force is applied to the middle of the string, no matter the size, the horizontal force upon the trees from the string is infinite. Or impossible to calculate. I know that there is no such thing as a totally inelastic string and so on, but what would physics be without "what if´s"? :) I've attached a picture of the problem with some units to it if someone would like to calculate it.