Timeline for Why does the work done by an internal force differ from the work done by external force?
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Sep 12, 2014 at 12:55 | vote | accept | neverneve | ||
| Sep 10, 2014 at 17:59 | comment | added | neverneve | Continuation: It seems that we explain it in that way because that's what we observe, not because that's what the theory says. Do we have to bear with it, or am I wrong here? | |
| Sep 10, 2014 at 17:54 | comment | added | neverneve | Thank you for your answer. So we've come to this: work is always a transfer of one kind of energy to the other, but if the force is external, the energy of the system changes because we don't have a complete picture. If instead our system comprised also of the cause of the force, the energy would be conserved in that system. But there's another thing that bothers me still: it seems, that this reasoning derives from experience. That is, there seems to be no proof that an internal force can't increase the system's energy or a work done by an external force can't keep the energy constant. | |
| Sep 10, 2014 at 9:12 | history | answered | John Rennie | CC BY-SA 3.0 |