Three-body inertia tensor

被引:4
作者
Ee, June-Haak [1 ]
Jung, Dong-Won [1 ]
Kim, U-Rae [1 ]
Kim, Dohyun [1 ]
Lee, Jungil [1 ,2 ]
机构
[1] Korea Univ, Dept Phys, KPOPE Collaborat, Seoul 02841, South Korea
[2] Korea Pragmatist Org Phys Educ KPOPE Collaborat, Seoul, South Korea
基金
新加坡国家研究基金会;
关键词
inertia tensor; three-body system; Lagrange's multiplier; principal axes; gauge fixing;
D O I
10.1088/1361-6404/abf8c6
中图分类号
G40 [教育学];
学科分类号
040101 ; 120403 ;
摘要
We derive a general formula for the inertia tensor of a rigid body consisting of three particles with which students can learn basic properties of the inertia tensor without calculus. The inertia-tensor operator is constructed by employing the Dirac's bra-ket notation to obtain the inertia tensor in an arbitrary frame of reference covariantly. The principal axes and moments of inertia are computed when the axis of rotation passes the center of mass. The formulas are expressed in terms of the relative displacements of particles that are determined by introducing Lagrange's undetermined multipliers. This is a heuristic example analogous to the addition of a gauge-fixing term to the Lagrangian density in gauge field theories. We confirm that the principal moments satisfy the perpendicular-axis theorem of planar lamina. Two special cases are considered as pedagogical examples. One is a water-molecule-like system in which a particle is placed on the vertical bisector of two identical particles. The other is the case in which the center of mass coincides with the incenter of the triangle whose vertices are placed at the particles. The principal moment of the latter example about the normal axis is remarkably simple and proportional to the product 'abc' of the three relative distances. We expect that this new formula can be used in actual laboratory classes for general physics or undergraduate classical mechanics.
引用
收藏
页数:18
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