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Module 10 : Vibration of Two and Multidegree of freedom systems; Concept of Normal Mode;
                      Free Vibration Problems and Determination of Ntural Frequencies;
                      Forced Vibration Analysis; Vibration Absorbers; Approximate Methods -
                      Dunkerley's Method and Holzer Method

Lecture 1 : Free Vibration of Two d.o.f. systems

	Concept of Normal Modes
	Consider	10.1.11
	If we substitute = in eq. (10.1.5), we get,
		10.1.10
	Thus the ratio of the amplitudes of the two masses is:
		10.1.13
	Similarly, if we substitute = in eq. (10.1.5), we get,
		10.1.14
	Thus the ratio of the amplitudes of the two masses for this case is:
		10.1.15
	Such synchronous motion of the masses with constant ratio of amplitudes is known as Normal Mode Vibration.