Mass whirling on table pulled by string through center

rcgldr

Quote by voko

The statement, by you and ehild, that the associated fictitious forces can be ignored entirely, is manifestly wrong, because the ## r\dot{\theta}^2 ## component, which is retained in the analysis, is the centrifugal term.

As mentioned in the above post, it's the centripetal force term (minus sign). For anyone reading this thread that may not have caught this, converting from polar to cartesian coordinates: ## - r\dot{\theta}^2 = - v^2 / r ##.

voko

Quote by vela

In a rotating frame, that term moves to the other side of F=ma and corresponds to the centrifugal force. See, for example, http://en.wikipedia.org/wiki/Polar_c...Coriolis_terms.

The article referenced, particularly the text under the "Co-rotating frame" heading, basically re-iterates what I have been saying all along. I understand that you can move one term in an equation from one side to another, flipping its sign as you go, and that you call that term different names depending on which side of the equation it is on, but I fail to see how that contradicts anything I have said.

Anyway, it seems the OP has long lost interest in this discussion, so I won't debate this any longer.

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