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Engineering Statics: Open and Interactive

Chapter 2 Forces and Other Vectors

Before you can solve statics problems, you will need to understand the basic physical quantities used in Statics: scalars and vectors.
Scalars are physical quantities that have no associated direction and can be described by a positive or negative number, or even zero. Scalar quantities follow the usual laws of algebra, and most scalar quantities have units. Mass, time, temperature, and length are all scalars.
Vectors represent physical quantities that have magnitude and direction. Vectors are identified by a symbolic name which will be typeset in bold like \(\vec{r}\) or \(\vec{F}\) to indicate its vector nature. The primary vector quantity you will encounter in statics will be force, but moment and position are also important vectors. Computations involving vectors must always consider the directionality of each term and follow the rules of vector algebra as described in this chapter.