This lecture introduces the concept of Lumped Element Modelling (LEM) in mechanical systems, simplifying complex systems into discrete elements that exchange energy. The lecture covers the equations of motion for a mass connected to a spring and damper, the modeling of complex springs, and the representation of a complex deformation as a simple spring. It also discusses the modeling of a simple cantilever and the use of lumped-parameter modeling in mechanics to reduce mechanical structures to mass-spring models. Additionally, it explores the exact analytical calculation of natural frequencies, the electrical equivalent circuit, and the generalized variables in different cases.