Inertia Matrix: What, How & When?

[nebbione]

hi everyone! I'm very confused about inertia matrix... i searched all over the web but didn't find a concise explanation of why it is useful to use it.
What's used for ? When should i use it ? the wikipedia explanation is too formal and it's difficult for me to understand... so can somebody give me an effective explanation on what is, how does it function and when i should use it ?


Thanks

 

[SteamKing]

The mass moment of inertia matrix is used in the analysis of the dynamics of a rigid body. These bodies commonly include aircraft, spacecraft , and marine craft.