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Chapter 6. Equilibrium of rigid bodies (I)

A rigid body is said to in equilibrium if the resultant of all forces and all their moments taken about any and all points are zero.

Free body diagram (FBD): depiction of an object with ALL the external forces acting on it.

Reactions coming from the supports: usually a body is constrained against motions using supports. It is essentially to correctly estimate the number and type of reactions that a support can provide.

http://www.slideshare.net/kevyn52/equilibriumofrigidbody

A slide-share presentation about equilibrium can help you to understand the key concepts of this chapter:

https://slideplayer.com/slide/4577628/