This lecture covers the concept of force balancing mechanisms, focusing on the importance of having balanced force in industrial machines to prevent vibrations, noise, premature wear, and energy loss. It discusses the historical background of force balancing, the definition of force-balanced mechanisms, and the passive force balancing techniques. The lecture also explains the criteria for a mechanism to be considered force-balanced and the implications of dynamic efforts on the structure. Examples and practical considerations for force balancing mechanisms are presented.