I never took physics in high school or college (I majored in English.). However, take a look at this wave machine video by the National STEM Center and the Institute of Physics, Alom Shaha. It’s both creative and technical…or visibly smart!
I can see how doing it with kids in a classroom would be a big hit to explain technical concepts. It was interesting to watch and hear the explanation about energy, disturbance, twist, and the speed of the wave. Without watching the video can you say what would cause the speed of the wave to increase?