Timeline for Why does Work Done Appear to be More than 100% Energy in a System?
Current License: CC BY-SA 3.0
3 events
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| Jul 26, 2017 at 21:03 | comment | added | Bill N | Heat is a transfer of energy due to temperature differences. The temperature increase of an object due to friction is a mechanical process, not heat in the proper physics definition. And objects do not contain heat. When you rub your hands together rapidly, the increase in temperature is due to part of kinetic energy of the hands and arms being transferred (by work) into the molecular structure, increasing the KE of those molecules. The internal energy increases. The hands will then emit heat (energy transferred) because they are warmer than the surroundings. | |
| Jul 26, 2017 at 19:30 | comment | added | Marc Striebeck | Hi, those are both good enough answers for me. I probably should not have included a light bulb as a load, although yes in an ideal situation, if there is such a thing, the energy is wasted away as heat waste. As with the motor we can at least see what's going in, but it also has losses such as frictions of all sorts, lenz's law and too many really to mention right here and right now. | |
| Jul 26, 2017 at 19:13 | history | answered | Bart W | CC BY-SA 3.0 |