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Inertia in rotational motion

  1. Aug 14, 2014 #1
    Why do we use inertia in rotational motion and not the whole mass of an object ?
  2. jcsd
  3. Aug 14, 2014 #2

    Doc Al

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    Staff: Mentor

    What do you mean?

    Do you mean rotational inertia? (Moment of inertia.) If so, realize that rotation and translation have their differences.
  4. Aug 14, 2014 #3


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    Gold Member

    I remember any introductory text on the subject gives enough arguments and calculations!
    Grant R. Fowles' Analytical mechanics is enough I think.
  5. Aug 14, 2014 #4


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    The moment of inertia is a calculation that does consider the whole mass of the object, as well as some information about the distribution of the mass about the rotational axis.
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