A wrench provides a familiar example. A force $$\vec{F}$$ applied to the handle of a wrench, as shown in Figure 4.0.1, creates a moment $$\vec{M}_A$$ about an axis out of the page through the centerline of the nut at $$A\text{.}$$ The $$\vec{M}$$ is bold because it represents a vector, and the subscript $$A$$ indicates the axis or center of rotation. The direction of the moment can be either clockwise or counter-clockwise depending on how the force is applied.