http://griffinphysics.blogspot.com/2011/12/physics-swing-circular-motion-blog-5.html
This swing in this blog's video demonstrates the concept of resonance. If I push at the right time and create a "standing wave" I can increase the amplitude of the wave. The amplitude in this instance is the height of the swing, by pushing the swing when it is going forward, I can create resonance. The frequency and wave speed will still remain the same. If I increased the frequency of the swing, then the wave length would decrease.
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