Two swings

HOW

1. Two people are needed for this experiment.
2. Swing on only one swing, let the other one remain stationary. Once the first swing has been significantly rocked, allow the swings to move freely. How do the swings behave?
3. Now try swinging so that the swings move in the same direction simultaneously – this is a symmetrical vibration.
4. Try swinging in such a way that the swings move in opposite directions simultaneously – this is an anti-symmetrical vibration.

WHY

Two swings connected by a rope are a model of coupled pendulums. By sitting on the swing, you become part of this model. When one person swings and then both people allow the swings to move freely, the phenomenon of vibration transmission can be observed. The swing, which has been stationary until now, moves with increasing amplitude (increases the swing). At the same time, the vibration amplitude of the first swing decreases. After some time, the cycle is repeated. The phenomenon does not occur indefinitely due to the resistance in motion present in the system.