Exercise 1: For the truss structure and loading shown,

  1. determine whether it is stable or unstable.
  2. Identify the correct free-body diagram.
  3. Calculate the reactions at each support.

Free-Body Diagram (a) Free-Body Diagram (b)

Free-Body Diagram (c)

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    Stable   Unstable 

Free-body(a)   Free-body(b)   Free-body(c)

R1-x = N   R1-y = N   R8-y = N