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"Carl E. Mungan" wrote:
> I posed this question the other day and I have not seen
> an answer yet. Here it is again. I stop a block with a
> string. No change in the block's thermal energy occurs.
> Now I stop the block via sliding friction. The block's
> thermal energy changes. Why does friction change the
> thermal energy of an object but tension does not (in
> these particular situations)?