A block of mass m moves on a horizontal rough surface with initial velocity v. The height of the centre of mass of the block is h from the surface. Consider a point A on the surface.
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Question

A block of mass m moves on a horizontal rough surface with initial velocity v. The height of the centre of mass of the block is h from the surface. Consider a point A on the surface.

G1 Physics · Accepted Answer

Initially L about A=mvh. Friction reduces v. Taking moments about A, normal and weight generally give non-zero net torque, so angular momentum about A is not conserved. Hence A,B,D.