## Work

$\Delta U=q+w$

Cecilia Jardon 1I
Posts: 74
Joined: Fri Sep 28, 2018 12:16 am

### Work

When work is done on its surrounding that means work is done by the system, therefore, it is negative right?

Samantha Man 1L
Posts: 63
Joined: Fri Sep 28, 2018 12:22 am

### Re: Work

Work is positive if work is done by the system and it's negative if work is done on the system.

Diana Bibireata 1B
Posts: 60
Joined: Fri Sep 28, 2018 12:23 am

### Re: Work

If work is done on the system, w is positive because the energy of the system has increased. If work is done by the system, w is negative because the energy of the system has decreased.

Eric Quach 1C
Posts: 30
Joined: Fri Sep 28, 2018 12:20 am

### Re: Work

Yep if work is done by the system to the surrounding then the work is negative. If work is done by the surroundings on the system then work is positive. It's similar to q where if heat is released to the surroundings then q is negative. However, if the system gains heat, then q is positive.