Pendulum resonance. Fun physical experience at home

ENTERTAINING EXPERIENCES AT HOME
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Pendulum resonance. Physical experiments

Entertaining experiments in physics

Entertaining experiences at home / Physics experiments for children

First you need to prepare a place for this experience. A good place would be a doorway, in which, at a certain height, use the buttons to fasten a thin twine horizontally. Hang four pendulums on it: two of the same length and two of different lengths. Make one of the pendulums of different lengths two times shorter than the same pendulums, the other two times longer. Pendulums can be made by tying thin twine to spent batteries from a transistor receiver. Hang our pendulums on a stretched rope at the same distance from each other, and hang pendulums of the same length in the middle.

Pendulum resonance

Reject one of the identical pendulums and release it. He will start to swing. After a while, a pendulum hanging nearby, of the same length, will also begin to swing. The oscillations of the first pendulum were transmitted through the rope to its neighbors, but only one pendulum of the same length responded to these oscillations. About such pendulums, which take over vibrations from each other, they say that they are tuned into resonance. The main condition for resonance is the same length of the pendulums. The rest of the pendulums did not even budge, except that they began to move a little in different directions from the slight vibration of the rope on which they were hanging. But this erratic movement has nothing to do with the harmonic oscillations of pendulums of the same size.

The swing of pendulums can be observed for a long time. It is interesting how one of the pendulums almost stops at times, then swings again under the influence of the neighboring one.

Now, at the longest pendulum, shorten the rope, make it the same length as two identical ones. Three identical pendulums are now hanging. Swing any of them, the other two will also begin to sway. Watch how they alternate between increasing sway and gradually fading out. The fourth pendulum on a short rope will still be indifferent to the swing of its neighbors.

Author: Rabiza F.V.

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