Equation 10.26b is sometimes called the virtual work equation, which is something of a misnomer, as it is in fact a power equation. When this analysis approach is applied to a statics problem, there is no motion. The term virtual work comes from the concept of each force causing an infinitesimal, or virtual, displacement of the static system element to which it is applied over an infinitesimal delta time. The dot product of the force and the virtual displacement is the virtual work. In the limit, this becomes the instantaneous power in the system. We will present an example of the use of this method of virtual work in the next chapter along with examples of the newtonian solution applied to linkages in motion.