Work done on / work done by system


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Tia Tomescu 2D
Posts: 42
Joined: Fri Sep 29, 2017 7:06 am

Work done on / work done by system

Postby Tia Tomescu 2D » Sat Jan 20, 2018 9:06 pm

Could anyone explain to me they difference between work done on the system and work done by the system? I have trouble grasping the concept of work and the system.

504754253
Posts: 45
Joined: Fri Jun 23, 2017 11:39 am

Re: Work done on / work done by system

Postby 504754253 » Sat Jan 20, 2018 9:19 pm

work done on a system means energy comes in while work done by the system mean energy is taken out

Scout_2C
Posts: 15
Joined: Fri Sep 29, 2017 7:05 am

Re: Work done on / work done by system

Postby Scout_2C » Sat Jan 20, 2018 9:21 pm

When work is done BY the system, then w(work) = some NEG value.

When work is done TO the system, then w = some POS value.

Kevin Tabibian 1A
Posts: 42
Joined: Fri Sep 29, 2017 7:06 am

Re: Work done on / work done by system

Postby Kevin Tabibian 1A » Sat Jan 20, 2018 9:25 pm

Work done on a system means that the internal energy of the system will increase, because the surroundings are placing work unto the system.
Work done by a system means that the internal energy of the system will decrease, because the system is placing work unto the surroundings.

Christy Zhao 1H
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

Re: Work done on / work done by system

Postby Christy Zhao 1H » Sun Jan 21, 2018 10:56 am

When work is done to the system, energy is added and work is positive. When work is done by the system, energy leaves the system and work is negative.

RussellChin_3A
Posts: 42
Joined: Sat Jul 22, 2017 3:01 am

Re: Work done on / work done by system

Postby RussellChin_3A » Sun Jan 21, 2018 2:08 pm

Work done on the system means that the system is receiving the work so it is then written as +w. Work done by the system means the system is expending energy to do the work and so the work is -w.


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