Sorry for not using the template, but this question I have is not very complicated (or I hope so). I was creating a couple of problems with beams (Statics) and I came up with one where one of the support reactions has a negative value. The beam has 2 supports, one of them restricts all possible movements, and the other one allows movement only on the X axis (horizontal movement). Now, I'm not sure if that is possible, since (I think) that would make the system rotate around the support with the positive reaction. So, my question is, if it is possible for reaction forces to be negative.