First Law

[Emily Orozco L4]

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

[Tracy Tolentino_2E]

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

[smurphy1D]

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

[ALegala_2I]

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.

[Kavya Immadisetty 2B]

Internal energy is the sum of potential and kinetic energy.

[Pablo 1K]

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