In statics, *m**oments *are effects (of a force) that cause rotation. When computing equilibrium, you must be able to calculate a moment for every force on your free-body diagram. To determine a force's moment, you use one of two different calculations, as you can see in the following list.

**Scalar calculation (for two dimensions):**To calculate the moment about a Point O in scalar calculations,**F.****Vector calculation (for two or three dimensions):**To compute the moment vector about a Point O in vector calculations, you must determine the Force**F**in Cartesian vector form and the position vector from Point O to the line of action of the Force**F.**