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d'Alembert discussed in his treatise on Dynamics that one may treat dynamics problems as statics problems, if you use the inertial reaction as a "fictitious force", which in this case is centrifugal "force". F = ma becomes F - ma = 0, where -ma is the fictitious force. As HuyV7 said, these are convenient when writing force diagrams in an accelerated reference frame. But, as tmaccarone39 points out, you can't include these fictitious forces along with the inertial reactions.
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