Answer:
The answer is: In the presence of a damping force, the energy of the system also decreases.
Step-by-step explanation:
In non-conservative oscillating systems, the frictional force opposes the restorative force generated by the MAS, acting as a damping force. The presence of a frictional force determines that the energy of the system decreases, consequently decreasing the amplitude of the oscillations as a function of time.
The answer is: In the presence of a damping force, the energy of the system also decreases.