Many of us have seen pendulum waves in a physics class or two in the past. The ScienceGeek DIY Pendulum Wave Model lets you conduct your own experiments. It has a wooden frame, nylon string, and 9 steel balls. Simply use the wooden strip to make the steel balls move.
This is a DIY kit, so you will have to spend a bit of time putting it together. The good news? It is pretty affordable.
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