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Jun 1, 2018 at 23:17 comment added Gilbert @JánLalinský Of course! It all comes down to how you define what is in the system and what is out.
Jun 1, 2018 at 20:55 comment added Ján Lalinský Friction does not necessarily mean energy is lost to the outside of the system; work or kinetic energy may be converted into internal energy while still remaining in the system.
Jun 1, 2018 at 14:12 history answered Gilbert CC BY-SA 4.0