Understanding Rotational Acceleration and the Role of Normal Force

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The discussion clarifies that the moment of inertia (IG) is calculated about an axis perpendicular to the page, focusing solely on tangential force (Ft) and not including normal force (Fn). It emphasizes that the sum of moments about point O involves only the moment due to Ft, as Fn affects rotational accelerations around axes within the plane of the page. The normal force is relevant for rotational acceleration in different orientations but does not contribute to the moment about the specified axis. The total moment about point M is thus considered only for rotational acceleration related to tangential acceleration. Understanding these distinctions is crucial for analyzing rotational dynamics accurately.
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in this notes , the author gave that the IG is the moment of inertia calculated about an axis which is perpendicular to the page ...

moment of inertia calculated about an axis which is perpendicular to the page here means id due to Ft(tangential force) only ? not include Fn ( normal force ) ? So , for the sum of moment about O , it's involve only moment due to Ft only ? Not include Fn ? Why ? can you explain ?
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That is for the rotational acceleration around the axis coming out or the page. The normal force will have an effect on rotational accelerations around other axes which are on the plane of the page.
 
FactChecker said:
That is for the rotational acceleration around the axis coming out or the page. The normal force will have an effect on rotational accelerations around other axes which are on the plane of the page.
So the total moment about M is considering only the rotational acceleration about the axis which is outside of the page(tangential acceleration)?
Why the total moment about O doesn't include the normal acceleration?
 

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