5 thoughts on “5.57”

    1. I don't entirely understand your question, k_{\theta_4} was never defined in the solution.

      Are you asking why k_{\theta_2 was chosen as the name for the stiffness of the shaft between the disk labeled I_4 and the one labeled I_5 instead of k_{\theta_4}? If so, I don't have a good answer. It needed a name and I grabbed the first one that came to mind.

    1. The methodology is basically Newton's third law. We know that there is a force at play between the two gears, thus we should suppose they are equal and opposite. The actual direction we assume them to be pointing is irrelevant (the math may tell us that the magnitude of the force is negative and thus correct our assumption); what does matter is that we draw the forces as equal but opposing.

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