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In physics, the parallel axis theorem, also known as Huygens–Steiner 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. ==Mass moment of inertia== Suppose a body of mass is made to rotate about an axis passing through the body's center of gravity. The body has a moment of inertia with respect to this axis. The parallel axis theorem states that if the body is made to rotate instead about a new axis which is parallel to the first axis and displaced from it by a distance , then the moment of inertia with respect to the new axis is related to by : Explicitly, is the perpendicular distance between the axes and . The parallel axis theorem can be applied with the stretch rule and perpendicular axis theorem to find moments of inertia for a variety of shapes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「parallel axis theorem」の詳細全文を読む スポンサード リンク
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