Resultant (statics)
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In statics the resultant of a system of forces acting at various points on a rigid body or system of particles is a single force, acting at a single point, if one exists, which is equivalent to the given system.
Suppose that forces Fi act at points ri. The resultant would be a single force G acting at a point s. The systems are equivalent if they have the same net force and the same net moment about any point.
These condition are equivalent to requiring that