What is happening on a molecular level when an elastic stretches? Why are some substances elastic but others are not?
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Rubber Bands by Richard Feynman: https://youtu.be/XRxAn2DRzgI
Whole Video: https://youtu.be/P1ww1IXRfTA
This is one of the best physics explainers who ever lived. I sent a snippet where he explains rubber bands but I highly recommend watching the whole video where he explains the fundamentals.
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