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Negative work

Posted: Wed Feb 12, 2020 9:07 am
by Rita Chen 1B
When is work negative?

Re: Negative work

Posted: Wed Feb 12, 2020 9:07 am
by Daniel Toscano 1L
When a system does work

Re: Negative work

Posted: Wed Feb 12, 2020 2:51 pm
by Jessica Li 4F
Work is negative when a system does work, which means that it expands. If you do work, you lose energy, so it is negative. On the other hand, work is being done on the system when it is compressed. Think of it as the system can expand by itself, but you have to do something to the system to compress it.

Re: Negative work

Posted: Sat Feb 15, 2020 11:54 am
by Matthew Tsai 2H
When a system does work, it loses energy in the process, so the value for w is negative.

Re: Negative work

Posted: Sat Feb 15, 2020 3:07 pm
by Jacob Motawakel
A system's work is negative when that system does work, Work is positive for a system if work is done on that system.

Re: Negative work

Posted: Sat Feb 15, 2020 3:17 pm
by Callum Guo 1H
when your system does work. so in this class, most of the time its when a gas expands.

Re: Negative work

Posted: Sat Feb 15, 2020 3:48 pm
by Amanda Mei 1B
When a system pushes against an external force (pressure), it loses energy and thus work is negative. Usually this causes volume to expand.

Re: Negative work

Posted: Sat Feb 15, 2020 5:28 pm
by HuyHa_2H
Work is negative when a system is doing work because that's what it loses hence the negative. Conversely, it's positive if something else is doing work on the system.

Re: Negative work

Posted: Sat Feb 15, 2020 9:11 pm
by Kayli Choy 2F
Work = -(pressure)(FinalVolume - InitialVolume). Therefore, if your final volume is greater than your initial volume (gas expands) then your change in volume will be positive, so this is why work will be negative. Additionally if your initial volume is greater than your final volume (gas is compressed), then your change in volume will be negative, so work will be positive.

Re: Negative work

Posted: Sun Feb 16, 2020 9:56 pm
by Matthew Chan 1B
Work is negative when the system does work itself, which makes sense since the system is "losing" work/energy, which makes sense why it would be negative.

Re: Negative work

Posted: Sun Feb 16, 2020 10:00 pm
by Nikki Razal 1L
when a system does work, it is by a negative sign

Re: Negative work

Posted: Sun Feb 23, 2020 11:41 pm
by CalvinTNguyen2D
Work, as viewed through the lenses of chemistry, is positive when it is being done ON the system. Therefore, work is negative when the system itself is doing work on the surroundings.

Re: Negative work

Posted: Mon Feb 24, 2020 10:46 am
by lauraxie2e
when the system does work on the surroundings

Re: Negative work

Posted: Mon Feb 24, 2020 11:23 am
by Elizabeth Harty 1A
When a system does work the value is negative

Re: Negative work

Posted: Tue Feb 25, 2020 8:56 pm
by Ian Morris 3C
if a system is negative, then it just has done work