We discuss the concept of the surface energy of a solid. Our point of view is that the surface enrgy, as classically defined, is but one attribute of a more general distance-dependent interaction between bodies. We argue that the mechanics of adhesion and fracture of solids can be correctly modeled by the incorporation of classical surface energy into a conventional elastic model. As evidence of this, we reconsider a classical model of Obreimoff for the cleaving of mica. Our analysis shows that the introduction of a short-range distance-dependent interaction leads to the system being governed by an effective surface energy which is 2.25 times larger than the surface energy as classically defined.