There is a concept in physics called resonance. In lay terms, it describes the fact that for any given object there are natural frequencies at which the object “likes to vibrate”. A simple pendulum’s natural frequency is the rate at which it swings back and forth; if you wiggle the pendulum at the same frequency, the pendulum will swing farther and higher, but if your movements don’t match its own natural rhythm, it will only dampen the swing instead.
