As a Result of Friction Between Internal Parts of an Isolated

Multiple Choice

As a result of friction between internal parts of an isolated system

A) the total mechanical energy of the system increases.
B) the total mechanical energy of the system decreases.
C) the total mechanical energy of the system remains the same.
D) the potential energy of the system increases but the kinetic energy remains the same.
E) the kinetic energy of the system increases but the potential energy of the system remains the same.