In this chapter you will study the effect of forces acting on particles.
First you will learn how to replace two or more forces acting on a
given particle by a single force having the same effect as the original
forces. This single equivalent force is the resultant of the original
forces acting on the particle. Later the relations which exist among
the various forces acting on a particle in a state of equilibrium will be
derived and used to determine some of the forces acting on the
particle.
The use of the word particle does not imply that our study will
be limited to that of small corpuscles. What it means is that the size
and shape of the bodies under consideration will not significantly affect
the solution of the problems treated in this chapter and that all
the forces acting on a given body will be assumed to be applied at the
same point. Since such an assumption is verified in many practical
applications, you will be able to solve a number of engineering problems
in this chapter.
The first part of the chapter is devoted to the study of forces contained
in a single plane, and the second part to the analysis of forces
in three-dimensional space.
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