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We discuss the concept of the surface energy of a solid. Our point of view is that the surface energy, 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.

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