The wave demonstrator really takes advantage of momentum, leverage and energy.
By twisting the Gaffa tape at the bottom of the demonstrator you are storing potential energy within the tape. This potential energy is released as the Gaffa tape unwinds, transferring the energy into kinetic energy outwards toward the Jelly babies on the end of the stick. Once moving, the Jelly babies have considerable momentum and so continue to spiral around the Gaffa tape, transferring most of that energy back into the Gaffa tape. The Gaffa tape can't help but twist up again, which causes the tape to then subsequently release the energy as it unravels yet again...transferring that the energy onwards to the next row of kebab sticks. The process continues until the energy dissipates out of the system.
This is a great demonstration of energy and not matter travelling throughout a system, which is essentially what happens in waves.
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