There are four known fundamental forces of nature and there is a need to combine them into a unified theory. Progress has been made toward this goal but gravity remains an issue. However, the four forces are body forces that act on points. They together do not make the universe a closed system. Here, I identify a surface force, which acts outward normal to the surface of the universe. Further, using water drop hanging in a vacuum as a model, I provide a formula to find the magnitude of this force. The fifth force is generated by surface tension, a property of dark energy. On the other hand, matter particles interact with each other through cohesive forces and with dark matter through adhesive forces. I give a range of functional forms of all cohesive and adhesive forces and present an equation that unifies all the forces of nature.