Resonance

Question 1

Free oscillations

Answer 1

Where an undamped oscillator is allowed to vibrate freely at its natural frequency

Question 2

Forced oscillations

Answer 2

A periodic force is applied to an oscillator. This force adds / removes energy depending on whether or not it is in phase with the oscillations

Question 3

Resonance

Answer 3

When the natural frequency of the driver is equal to the natural frequency of the driven oscillator.
Produces maximum amplitude of oscillations.

Question 4

Critical damping

Answer 4

Amplitude tends to zero in T/4