Forget What Your Teacher Said: Mass And Weight Are The Same

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At high school, your physics teacher probably drummed it into you that mass and weight are completely different things — but actually, they were wrong all along. In this video, Professor Mike Merrifield from the University of Nottingham — along with Albert Einstein and Isaac Newton — explains the equivalence principle. It says that mass and weight are, really, the same thing.

Maybe you should go tell your old teacher. [Sixty Symbols]