The acronym FN on a force diagram would represent Normal Force. That is option C.
A force diagram is the type of diagram that illustrates the different types of forces acting on an object.
The types of forces that can be represented by a force diagram include the following:
The normal force (FN) is the force that is acting of the object which is perpendicular to the surface the object is in contact with.
Learn more about forces here:
https://brainly.com/question/12785175
#SPJ1