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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

	For a non-trivial solution, we can write,
		10.1.6
	Therefore we have the frequency equation / Characteristic equation:
		10.1.7
		10.1.8
	The “natural frequencies” of the system are obtained as the solutions of the characteristic frequency equation as follows:
		10.1.9
		10.1.10
	when
	we get