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Postby melissa_dis4K » Thu Jan 31, 2019 8:31 pm

How can you determine whether work was done by or on a system? Thank you.

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

Re: Work

Postby Lauren Ho 2E » Thu Jan 31, 2019 8:34 pm

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

Jessica Tsui 1H
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Joined: Fri Sep 28, 2018 12:21 am

Re: Work

Postby Jessica Tsui 1H » Thu Jan 31, 2019 9:41 pm

When work is done on a system, w is positive. When work is done by a system, w is negative.

Millicent Navarro 1I
Posts: 61
Joined: Fri Sep 28, 2018 12:25 am

Re: Work

Postby Millicent Navarro 1I » Fri Feb 01, 2019 1:22 am

Personally, what helps me the most is by looking at the keywords the problem is giving me. For example, if I see "work being done", I automatically assume it is positive because there is energy being entered on a system.

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