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This lecture covers the concepts of potential energy, mechanical energy, and resonance, focusing on a material point oscillating on a circle and an asymmetric pendulum. It discusses equilibrium positions, stability, trigonometry formulas, and the conservation of mechanical energy. The instructor explains the physical interpretations, kinetic and potential energies, equations of motion, and small oscillations around stable equilibrium. The lecture also delves into the pulsation, equilibrium angles, and harmonic oscillators. It concludes with the analysis of an asymmetric pendulum, including kinetic and potential energies, equations of motion, and small oscillations. Various trigonometric identities and oscillation periods are explored.