5 thoughts on “3.3”

    1. I wouldn't say that I forgot it, I omitted it intentionally because the original drawing was given in equilibrium. As such is the case the coordinate (Y) describes the displacement of the beam (spring) from the equilibrium position. The weight is offset by the initial deflection of the beam (from the unstretched position to equilibrium).

      Please see my video about the equilibrium assumption!

      Edit: also, it wasn't the mass that was omitted, but the weight!

  1. What do you suggest for students, like me, who would be penalized for simply "omitting the weight" for the equilibrium position? For each problem, should I just apply your weight-omitting derivation found in your Equilibrium Assumptions video?

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Tutoring for Statics, Dynamics, and Controls courses at Texas A&M