Venkatesh Rao@vgrQ: If I have a surface with grain (anisotropic) what's functional form of coeff of friction? See sketch. ~=Ellipse?10:36 PM · Sep 14, 20161 Quote Tweet
Biswajit Banerjee@parresianz·Sep 14, 2016Replying to @vgrIt's a rank-2 tensor, representable as a 2x2 matrix.11
Venkatesh Rao@vgr·Sep 15, 2016Replying to @parresianzdo the off-diagonal terms have a physical interpretation?1