In this video, we go from 2D particles to looking at 3D force systems and how to solve for them when they are in equilibrium. You MUST know how to express forces in cartesian form, if you need a refresh, please see the following video first:    • Force Vectors Along a Line | Mechanic...  

Intro (00:00)
Determine the force in each cable needed to support the 20kg flowerpot (00:46)
The ends of the three cables are attached to a ring at A (02:29)
Determine the stretch in each of the two springs required to hold (04:52)

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Book used: R. C. Hibbeler and K. B. Yap, Engineering Mechanics Statics.
Hoboken: Pearson, 2017.