Resonance: Feynman's Physics Explained
Push a child on a swing at just the right moments and she goes higher and higher — that is resonance. A system with a natural frequency responds dramatically when driven at that same frequency, so a small, well-timed push builds a very large motion. This idea is everywhere, from tuning a radio to a particular station to the sharp spectral lines of atoms and the behavior of subatomic particles.
The big idea
Push anything at its natural rhythm and the response grows huge.
Think about it
Why does timing your pushes on a swing matter so much more than how hard you push?
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