The resultant force is simply the sum of the total external forces acting on a body.
Fres = ∑i=1nFi = F1 + F2 + ...
Geometrically, the resultant force R of two forcesP and Q is shown in Figure 1. The law of the
parallelogram of forces states that given two vectors, the resultant force of using these vectors as
sides to a parallelogram is the diagonal of the parallelogram.
Figure 1: Resultant force and the law of the parallelogram of forces.
References
[1] Brooke, William; Wilcox, Hugh. ”Engineering Mechanics”. Ginn and Company,
Boston, 1929. [2] Ling, Samuel et al. ”University physics”. Volume 1. OpenStax College, Houston, 2021.
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