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To summarize: A key part of the algorithm is noticing where the ener=
gy=20
went, and whether you can keep track of the details. If you can't ke=
ep=20
track of the details, it's probably thermal.
Can we say that both friction and tension change the thermal energy of
objects but friction changes it in the block and tension changes it in the
person holding the string?
The main point is the 100% KE --> Eth conversion, not
how the H=deltaEth is distributed at any particular
moment. If you wait long enough (in a perfectly sealed
room) then the final outcome should be the same in both
cases, a change of temperature of everything in that
room by 0.0000...1 C.