## Work Done

$\Delta U=q+w$

makenzie2K
Posts: 31
Joined: Fri Sep 28, 2018 12:20 am

### Work Done

How do we know whether work is being done on the system by the surroundings, or if the surroundings are doing work on the system? How does this change the sign of w?

Lauren Ho 2E
Posts: 70
Joined: Tue Oct 09, 2018 12:16 am

### Re: Work Done

If energy leaves a system, the system does work on its surroundings. If energy enters a system, work is done on the system.

caseygilles 1E
Posts: 73
Joined: Fri Sep 28, 2018 12:18 am

### Re: Work Done

Work will have a negative sign if the the system does work on its surroundings, it will be releasing energy to the surroundings. Work will have a positive sign if the surroundings are doing work on the system, aka energy is being gained by the system.