名詞

(複數)

1. (物理學，classical mechanics) 轉動慣量

   The moment of inertia of a rigid body is a quantity that determines the needed for a given about a given rotational axis, analogous to how determines the needed for a given .

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   • 1882, , The Elementary Part of a Treatise on the Dynamics of a System of Rigid Bodies, 4th版, MacMillan & Co.，頁號 10:

     The moments of inertia of a heterogeneous body whose boundary is a surface of uniform density may sometimes be found by the method of differentiation.

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   • 1884, , An Elementary Treatise on the Integral Calculus, 4th版, Appleton and Company，頁號 292:

     Consequently, the moment of inertia of a body relative to any axis can be found when that for the parallel axis through its centre of gravity is known.

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2. (工程學，structural engineering) 截面二次轴矩
   • 2007, Robert L. Mott, Applied Strength of Materials, 5th版, Taylor & Francis (CRC Press)，頁號 323:

     Stresses due to vertical shearing forces also depend on moment of inertia and are discussed in Chapter 8.
     Some mathematicians and stress analysts use the term second moment of area instead of moment of inertia. That term is, in fact, more descriptive of the definition of this property in the following discussion.

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