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This reminds me of our old discussion on centrifugal force. It is a no-no in HS physics meaning that a student is penalized in the (external) exams if he/she uses it e.g. in solving a problem. Of course, it does not harm students if they are told a bit about centrifugal force/inertial forces in the context of non-inertial frames once they are comfortable with forces in inertial frames. It might harm them if they leave HS with the belief that centrifugal force is evil and should be avoided at any cost :-).