Trust in Physics(youtube.com)
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Trust in Physics
https://www.youtube.com/watch?v=xXXF2C-vrQE
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Other lecturers have replicated this experiment, sometimes with the subject (often a student) simply standing still, rather than standing with their head against a wall. With no reference point for keeping the head still, some subjects end up leaning forward slightly after the ball is released... you can guess the result.