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A couple of commenters expressed concern over the use of centrifugal force after my rant on the use of the word force. So, what is the deal with these two terms? Are they ok to use? Are they real ...

In this post, I am going to talk about real and not-real forces, like the fake centrifugal force. (If you don't like the word fake you could replace that with fictitious.) First, an example: Suppose ...