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Published in:
2016 | OriginalPaper | Chapter
4. Resultant and Equilibrium of Forces Acting at a Point
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Abstract
This chapter deals with forces acting at a point. This, however, does not imply that the rigid body has to be small. Sometimes lines of action of all forces applied to a body intersect at the same point. Thus, the effect of these forces may be studied as if they would act at a point. Such forces are called concurrent. Any two nonparallel in-plane forces acting on a rigid body will always intersect in a point. When two forces are parallel and are opposite in direction, they are called a couple of forces (Sect. 2.2.2) and they form a moment that tends to rotate the body. The effect of moments on rigid bodies will be discussed in Chap. 5. When a moment is small, in engineering practice we often neglect its effect and consider forces as if they are acting at a point.