Systems of Forces in 3D

This lecture covers the analysis of systems of forces in three dimensions, focusing on moments and couples. The instructor explains how to determine the resultant force and moment about a given axis, providing examples and scalar components. The lecture also delves into the concept of equilibrium in 3D systems, emphasizing the importance of understanding the direction and magnitude of forces. Through various examples and calculations, students learn how to calculate moments and couples in 3D systems, preparing them to analyze and solve complex structural mechanics problems.