Abstract: Some monographs on mechanics of vibrations asserted that the choice of generalized coordinates establishes the types of coupling in vibration equations.The method of kineto-statics is applied here to drive the vibration equation.The discussion on a specific example and the analysis of the general case demonstrate that the types of coupling in vibration equations are independent of the choice of generalized coordinates of the system.

Key words: mechanics of vibration, coupling, generalized coordinates