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### Negative work

Posted: Wed Feb 12, 2020 9:07 am
When is work negative?

### Re: Negative work

Posted: Wed Feb 12, 2020 9:07 am
When a system does work

### Re: Negative work

Posted: Wed Feb 12, 2020 2:51 pm
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
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
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
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
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
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
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
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
when a system does work, it is by a negative sign

### Re: Negative work

Posted: Sun Feb 23, 2020 11:41 pm
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
when the system does work on the surroundings

### Re: Negative work

Posted: Mon Feb 24, 2020 11:23 am
When a system does work the value is negative

### Re: Negative work

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