Moment of inertia help

  • #1
what is a moment of inertia? I know it's used for angular mechanics (like angular velocity and stuff like that), but what is a moment of inertia? A good definition with some examples would help tremendously. Thank you much in advance :)
 

Answers and Replies

  • #2
tiny-tim
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hi michael! :smile:

just as the mass (or inertia) of a body is the ratio between any force on it and its (linear) acceleration,

so the moment of inertia of a body is the ratio between the moment of force (also called the torque) on it and its angular acceleration

in other words: mass (or inertia) tells you how difficult it is to push, while moment of inertia tells you how difficult it is to turn :wink:

(for examples, see the pf library or wikipedia)
 
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