# Is the following equation a physical law, kinematic relationship, or material law? Here M = mass in.

Is the following equation a physical law, kinematic

relationship, or material law?

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Is the following equation a physical law, kinematic relationship, or material law? Here M = mass in.

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Here M = mass in volume V, dm = a mass element, r = position

vector of dm, and s is the position of the mass center.

Darcy’s law for fluid flow in porous media relates the

seepage velocity v to the hydraulic gradient h through a constant k (hydraulic

conductivity). Thus,

v = kh

Is this relationship a physical law, kinematic relation, or

material law?