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Calculating moment of inertia

by Luminous Blob
Tags: inertia, moment
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Luminous Blob
#1
Mar13-04, 12:48 PM
P: 50
I have a uniform rod of mass M, which rotates about one of its ends, and a point mass equal to the mass of the rod is added to the other end.

To calculate the new moment of inertia, do I just need to add the moment of inertia of the rod and that of the point mass together?

i.e. I = (MR^2)/3 + MR^2 ?

Any help would be much appreciated.
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ShawnD
#2
Mar13-04, 01:20 PM
Sci Advisor
ShawnD's Avatar
P: 986
Yes you add them together, but make sure you add them together with respect to the same axis. Remember the parallel axis theorum.
Luminous Blob
#3
Mar13-04, 11:04 PM
P: 50
Cheers for that.


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