Bilingual edition: English is preserved and Chinese follows each unit. Terminology uses the confirmed v20260916 glossary; automated semantic review remains traceable.
中英双语版：英文原文完整保留，中文紧随对应单元；术语采用 v20260916 确认表，自动语义审校结果可追溯。

Newton's 2nd Law: Rotation

牛顿第二定律：旋转

The relationship between the net external torque and the angular acceleration is of the same form as Newton's second law and is sometimes called Newton's second law for rotation. It is not as general a relationship as the linear one because the moment of inertia is not strictly a scalar quantity. The rotational equation is limited to rotation about a single principal axis, which in simple cases is an axis of symmetry.

净外力矩与角加速度之间的关系形式与牛顿第二定律相同，有时也称为转动的牛顿第二定律。这种关系不如线性情况那样普遍，因为转动惯量并不是严格的一个标量量。旋转方程仅限于绕单一主轴的旋转，在简单情况下，这个轴是对称轴。

Net external torque = moment of inertia x angular acceleration

合外力矩等于转动惯量乘以角加速度
N m = kg m2 x rad/s2


You may enter data for any two of the quantities and then click on the active text for the quantity you wish to calculate. The data values will not be forced to be consistent until you click on the quantity to calculate.

N m = kg m² x rad/s² 你可以输入任意两个量的数据，然后点击你想要计算的量的活动文本。数据值在你点击要计算的量之前不会被强制保持一致。
中文译文中的待填/计算数值依次对应：1：t 2：i 3：a。实际数值以上方原输入框为准。
 Index

Moment of inertia concepts
索引 转动惯量概念
 
HyperPhysics***** Mechanics ***** Rotation
HyperPhysics ***** 力学 ***** 转动
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