Parallel axis theorem

The mass moment of inertia of a body around an axis can be determined from the mass moment of inertia around a parallel axis through the center of gravity.

Parallel axes rule for area moment of inertia

Polar moment of inertia of a body around a point can be determined from its polar moment of inertia around the center of mass.

In physics, the parallel axis theorem, also known as Huygens–Steiner theorem, or just as Steiner's theorem, after Christiaan Huygens and Jakob Steiner, can be used to determine the mass moment of inertia or the second moment of area of a rigid body about any axis, given the body's moment of inertia about a parallel axis through the object's center of gravity and the perpendicular distance between the axes.

单词	Parallel axis
释义	Parallel axis 原声例句 Osmosis-神经 Changes like keeping the axis of the hands parallel to each other and the table, using a computer mouse instead of a trackpad and wearing wrist supports in splints while typing can all be super helpful. 如保持手与桌子平行，用电脑鼠标代替触控板，在打字的同时戴上护腕等这些方法都非常有帮助。英语百科 Parallel axis theorem In physics, the parallel axis theorem, also known as Huygens–Steiner theorem, or just as Steiner's theorem, after Christiaan Huygens and Jakob Steiner, can be used to determine the mass moment of inertia or the second moment of area of a rigid body about any axis, given the body's moment of inertia about a parallel axis through the object's center of gravity and the perpendicular distance between the axes.
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