work on the system or by the system

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Ghadir Seder 1G
Posts: 134
Joined: Sat Sep 14, 2019 12:17 am

work on the system or by the system

Postby Ghadir Seder 1G » Sun Feb 09, 2020 10:43 pm

How can you determine if work was done on the system or by the system given heat values ?

Thank you!

Niharika 1H
Posts: 50
Joined: Thu Jul 25, 2019 12:16 am

Re: work on the system or by the system

Postby Niharika 1H » Sun Feb 09, 2020 10:45 pm

W is positive if work is done by the system, and it's negative if work is done on the system.

Jessica Katzman 4F
Posts: 35
Joined: Mon Jun 17, 2019 7:24 am

Re: work on the system or by the system

Postby Jessica Katzman 4F » Sun Feb 09, 2020 10:50 pm

if work is done on the system, w is positive because the system is gaining heat. If work is done by the system, w is negative because it is giving heat.

Zoya Mulji 1K
Posts: 105
Joined: Thu Jul 11, 2019 12:15 am

Re: work on the system or by the system

Postby Zoya Mulji 1K » Sun Feb 09, 2020 10:51 pm

if you use deltaU=q+w then w is negative when work is done by the system and w is positive when work is done on the system (if you are taking the perspective of the system)

Ashley Nguyen 2L
Posts: 103
Joined: Sat Aug 17, 2019 12:18 am
Been upvoted: 1 time

Re: work on the system or by the system

Postby Ashley Nguyen 2L » Sun Feb 09, 2020 11:02 pm

If work is done by the system, then w should be positive (system is gaining heat). If work is done on the system, then w should be negative (system is losing heat).


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