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Moment of inertia of a point mass 
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#1
Sep1613, 02:39 AM

P: 7

Hello,
This is a very basic question. Wikipedia says moment of inertia I of a point mass m is calculated as: I = m * r^2 Where, r is distance from the axis of rotation. What this actually mean? I mean what is an r? 


#2
Sep1613, 02:47 AM

Sci Advisor
PF Gold
P: 1,427




#3
Sep1613, 04:02 AM

P: 70

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this is axis of rotation and in front ist point mass not full stop . it's at r dist from rod I=mr^{2} 


#4
Sep1713, 03:31 AM

P: 10

Moment of inertia of a point mass
moment of inertia of a point mass with respect to an axis is the product of mass times the distance of the axis
squared.So "r" is the distance of the mass "m" from the axis of roation. 


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