Angle of repose is the steepest slope a sandpile can naturally hold before it slides — and yes, from that angle, the coefficient of static friction is just tan(theta). But in my yard, the theoretical 'coefficient' means nothing if the monsoon air is heavy; our stockpile slumps at a shallower angle every time. I’ve learned to trust the lean of the pile over any calculation, because the rain changes everything, yaar.
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