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Jesse Kuehn 1B
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Joined: Wed Nov 14, 2018 12:23 am


Postby Jesse Kuehn 1B » Mon Jan 28, 2019 6:14 pm

How can you tell if the work is positive or negative with respect to a given system?

Madeline Ho 1C
Posts: 37
Joined: Mon Apr 23, 2018 3:00 am

Re: Work

Postby Madeline Ho 1C » Mon Jan 28, 2019 6:19 pm

If work is done on a system, the value is positive. If the system is doing work, the value is negative.

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Re: Work

Postby Megan_Ervin_1F » Wed Jan 30, 2019 1:35 pm

Why is work not a state property?

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Joined: Fri Sep 28, 2018 12:23 am

Re: Work

Postby Rachel-Weisz3C » Wed Jan 30, 2019 2:24 pm

Work is more complex than a state property. Work is dependent on the path used to get to its current state, which is the opposite of the definition of a state property which only depends on the state of the system.

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Joined: Fri Sep 28, 2018 12:24 am

Re: Work

Postby Danielle_Gallandt3I » Wed Jan 30, 2019 2:26 pm

Work is a type of energy transfer, so if work is being done TO as system the system is being transferred energy so it will be a positive value. If work is being done BY a system then energy is being transferred out of a system so it will be a negative value

JiangJC Dis2K
Posts: 72
Joined: Fri Oct 12, 2018 12:16 am

Re: Work

Postby JiangJC Dis2K » Wed Jan 30, 2019 3:29 pm

Lavelle gave a great example in class. If you are pumping a tire, you are putting work into the system (given that the tire/pump is the system). Therefore the work for the surroundings is negative because you are losing energy. But the work for the system is positive because it is having the work done to it.

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