1. Newtons sine-square law a)Newton considered a fluid flow as a uniform rectilinear stream of particles, much like a cloud of pellets from a shotgun blast Rectilinear stream of discrete particles Upon impacting the body, the particles give up the mentum normal travel downstream along the surface1. Newton’s sine-square law a) Newton considered a fluid flow as a uniform, rectilinear stream of particles, much like a cloud of pellets from a shotgun blast