What are natural frequencies?

Natural frequencies are the special speeds at which things vibrate when they're wiggled or bumped.

Imagine you have a playground swing. If you push it just right, not too fast, not too slow, it swings in a smooth, steady motion. That's because the swing has its own natural frequency, like a favorite song it likes to dance to.

When you first get on a swing, you might push it randomly. But once you find the right rhythm, the swing goes higher and smoother, that’s when it’s matching its natural frequency. It's like having a built-in beat inside everything!

If you push the swing too fast, it gets all wobbly and confused. If you push too slow, it barely moves. But if you match its natural frequency, ping!, it goes up and down like a happy song.

So, natural frequencies are just those special speeds that things really love to move at when they're shaken or pushed, kind of like how you find your favorite swing speed!