Page 1 of 1

work

Posted: Tue Feb 12, 2019 11:23 pm
by megangeorge-1K
If we are calculating work on a system and W is a positive number, does that mean work is done by the system or work is done on the system? What is the difference between these two?

Re: work

Posted: Tue Feb 12, 2019 11:28 pm
by Christopher Tran 1J
Work is being done on the system when w is positive, since the internal energy (U) of the system increases.

Re: work

Posted: Tue Feb 12, 2019 11:33 pm
by Daniel Lai
It means work is being done on the system.

Re: work

Posted: Fri Feb 15, 2019 3:42 pm
by Stevin1H
When the value of w is positive this means work is being done on the system (ex. is compression). This is because the formula for work is w=-PdeltaV so when there is compression from work being done on the system, the negatives will cancel out and the w becomes positive. Therefore, when work is being done by the system, this is a negative value because of expansion.

Re: work

Posted: Fri Feb 15, 2019 4:57 pm
by MadelynNguyen1F
The work done on the system will be positive if a system is compressed and delta-V is negative

Re: work

Posted: Fri Feb 15, 2019 5:01 pm
by Lopez_Melissa-Dis4E
When work is (+), then work is being done ON the system.
When work is (-), then work is being done BY the system.