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To understand resonance describe the exp...

To understand resonance describe the experiment of oscillations of five pendulums.

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Let us consider a set of five simple pendulums of assorted lengths suspended from a common rope as shown in figure.
The pendulum-1 and 4 have the same lengths and the others have different lengths.
Let us set pendulum-1 into motion. The energy from this pendulum gets transferred to other pendulum through the connecting rope and they start oscillating.
Pendulums-2,3 and 5 first start oscillating with their natural frequency of oscillations and different amplitudes, but this motion is gradually damped and not sustained. Their frequencies of oscillation gradually change and ultimately they oscillate with the frequency of pendulum-1. Thus is, the frequency of the driving force but with different amplitudes.
The pendulum-4 is in contrast to this set of pendulum-1. It oscillates with the same frequency as that of pendulum-1 and its amplitude gradually picks up and becomes very large. A resonance phenomena will occur. In general a system may have several natural frequencies. For examples, vibrating strings, air column etc.
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