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TSny
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It is also valid in certain other cases. It is valid if point ##p## is the instantaneous center of rotation. But it is not generally true that ##d L_p/dt = I_p \alpha## when ##p## is the instantaneous center of rotation. So, for the plank problem, I believe that ##d L_p/dt = I_p \alpha## needs to be justified. (I think it can be justified.)Pushoam said:You are asking for justification because ## \vec L_p = I_p \omega ## is valid only for fixed-axis rotation. Right?