## First Law

$\Delta U=q+w$

Emily Orozco L4
Posts: 45
Joined: Fri Sep 28, 2018 12:29 am

### First Law

By "internal energy" of an isolated system is it referring to heat?

Tracy Tolentino_2E
Posts: 140
Joined: Sat Sep 07, 2019 12:17 am

### Re: First Law

internal energy of a system refers to the sum of potential energy of the system along with kinetic energy.

smurphy1D
Posts: 51
Joined: Mon Nov 18, 2019 12:18 am

### Re: First Law

U is the measurement of the random movement of molecules inside of a system

ALegala_2I
Posts: 102
Joined: Thu Jul 11, 2019 12:17 am

### Re: First Law

In an isolated system, there is no transfer of heat or matter. In terms of internal energy (U=q+w), there is no heat exchange so q=0 and no change in matter so w=0. This means that the change in internal energy is equal to zero and that it remains constant throughout an experiment on an isolated system.

Posts: 106
Joined: Sat Aug 24, 2019 12:17 am
Been upvoted: 1 time

### Re: First Law

Internal energy is the sum of potential and kinetic energy.

Pablo 1K
Posts: 118
Joined: Sat Feb 02, 2019 12:15 am

### Re: First Law

It is the sum of all energy in the system both kinetic and potential.