TITLE: What is meany by point of oscillation and how is it difference from point of suspension ? Is both are intechangable?
QUESTION [0 upvotes]: Is O' is the point of oscillation ?

REPLY [1 votes]: The point of oscillation in a compound pendulum with centre of mass at C, and suspended from a point $A$, is the point B on the line AC such that if all the mass of the pendulum were concentrated at B then a simple pendulum of length $|{\rm AB}|$ would have the same period.  Thus AB is the effective length of the compound pendulum.
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