What are Free Vibration and Forced Vibration?

Answer: In states of free vibration, the amount of energy will not change. There is no net gain or energy loss due to any bodily processes. The amplitude of the body’s vibrations remains consistent over time.

During a forced vibration, additional energy is added to the vibrating body. The damping of the imposed vibration might either be present or absent. The amplitude of a violent vibration that is not damped tends to rise over time. The amplitude of a forced damped vibration will eventually become equal to a value at which the amount of energy lost each cycle will be similar to the amount of energy gained.