What is the law of rotational motion?

<p dir="ltr">The law of rotational motion follows &lt;a href="https://www.shiksha.com/preparation/physics-laws-of-motion-newtons-second-law-of-motion-5294-tp"&gt;Newton's second law&lt;/a&gt;. The net external torque acting on a rigid body is directly proportional to its angular acceleration. The constant of proportionality is the moment of inertia (I). That is a measure of an object's resistance to changes in its rotational motion. This relationship is mathematically expressed as&nbsp;<math > <mrow> <mi>τ</mi> <mo>=</mo> <mi>I</mi> <mi>α</mi> </mrow> </math>&nbsp;</p><p dir="ltr">Each component of the rotational law has a direct analogue in linear motion. Torque is analogous to force (F), moment of inertia (I) is analogous to mass (m), and angular acceleration is analogous to linear acceleration (a).&nbsp;</p><p dir="ltr">All in all, you just need to remember that just as force causes a change in linear motion, torque is the agent that causes a change in rotational motion.&nbsp;</p>

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