What is the variable A in the derivation for centre of percussion?

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SUMMARY

The variable A in the derivation for the center of percussion represents the distance from the pivot point to the center of mass of the object in question. This concept is crucial for understanding the dynamics of physical pendulums, as it also relates to the center of oscillation, which is defined as the position of a mass that has the same period as the physical pendulum. The discussion highlights the need for both theoretical and experimental methods to determine A, emphasizing its significance in the analysis of oscillatory motion.

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MathewsMD
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My original question was answered, but I would just like some clarification regarding one concept. In the derivation for the centre of percussion in this link (http://en.wikipedia.org/wiki/Center_of_percussion), what exactly is the variable A? How can it be determined (theoretically and/or experimentally)?
 
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A.T. said:
As the article says, distance from pivot to center of mass.

Ahh thank you. For some reason I just could not see it.

At the bottom of that section, it states: "This is also the center of oscillation of a physical pendulum of the same mass M, hung at the pivot point. (The center of oscillation is the position of the mass of a simple pendulum that has the same period as the physical pendulum.)[2]"

Does the article prove this at all? Maybe I'm missing something here, but is that statement an easily seen corollary? I can show it is true for single examples, but is there a proof for the general case?
 
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