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This lecture covers the relationship between normal stresses in beams and bending moments, explaining the moment-curvature relationship and the concept of the neutral axis. It also discusses the maximum stresses at cross sections, moments of inertia of plane areas, and the parallel-axis theorem. Additionally, it explores the flexure formula, strains in the transverse direction of beams, and the radius of gyration. Practical examples include calculating curvature in beams and determining maximum tensile and compressive stresses.