Auto/Motor A DIY Wooden EV Rolls Royce for Kids

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DIY Wooden Rolls Royce for Kids
 
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Thread 'Nonlinear rubberband type thing - "k" dropping fast as it is stretched'

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What materials can I try in order to get a curve of displacement versus force that looks somewhat like this.. (of course, there would be a small kink around the origin where the ends of the rubberband are closer together than its length, which is not shown here). I am looking for something that will last at least 100 stretch cycles and is not messy, so for example liquid based colloidal stuff won't be suitable. Is there something one can whip up using silicone and some additive, say? Or...
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