Coplanar Force Resultants.
We can use either of the two methods just described to determine the resultant of several coplanar force. To do this, each force is first resolved into its x and y components, and then the respective components are added using scalar algebra since they are collinear. The resultant force is then formed by adding the resultant components using the parallelogram law. For example,consider the three concurrent force in Fig. 2-17a, which have x and y component shown in Fig. 2-17b. Using Cartesian vector notation, each force is first represented as a Cartesian vector,i.e.