“Build rollers that move in whimsical ways or make surprising sounds as they scoot, wobble, and tumble down a wide wooden ramp. Learners observe the movements of the contraptions, make changes that affect the way they travel down the surface, and experiment with phenomena like gravity, friction, and balance. Make your own durable materials set to join our investigations of things that roll in funny and surprising ways!”
https://www.exploratorium.edu/tinkering/projects/open-kit-rollers
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