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this is a bungee cord that I soaked in

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water and then frozen my freezer

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overnight I suspended it between these

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two posts and attached this weight in

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the middle and speed this up you see as

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the bungee cord thor's it sags very

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slowly and gradually now i'm speeding it

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up a hundred times here and going back

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and forth look at the post on the right

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you can see it's moving back and forth

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as the bungee cord loses its little bit

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of stiffness that it had it acts more