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Resonance and forced vibrations can be demonstrated using a set of pendulums. Five pendulums A, B, C, D and E are suspended vertically from the same horizontal support as shown in the figure. Lengths of A and D are equal and hence their individual frequency of oscillations are equal. Pendulum A is now displaced to one side and hence set into motion. After some time, pendulum D starts vibrating and soon gains some amplitude. After some time, all energy of A is transferred to D and vibration amplitude of D becomes maximum while that of A is minimum. The exchange of energy takes place continuously. Other pendulums also oscillate with a smaller magnitude.

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