  We study the second derivative effects on the constitutive relations of an
uncharged parity-even Galilean fluid using the null fluid framework. Null
fluids are an equivalent representation of Galilean fluids in terms of a higher
dimensional relativistic fluid, which makes the Galilean symmetries manifest
and tractable. The analysis is based on the offshell formalism of
hydrodynamics. We use this formalism to work out a generic algorithm to obtain
the constitutive relations of a Galilean fluid up to arbitrarily high
derivative orders, and later specialise to second order. Finally, we study the
Stokes' law which determines the drag force on an object moving through a
fluid, in presence of certain second order terms. We identify the second order
transport coefficients which leave the drag force invariant.
