Unit Normal to Surface for a Force on the Fluid Element calculator uses unit_normal_to_surface = - Force /( Pressure * Area Element ) to calculate the Unit Vector Normal to the Surface, The Unit Normal to Surface for a Force on the Fluid Element is defined as a vector which is perpendicular to the surface at a given point.
In many cases, however, we will need to do the opposite. We will need to take a single vector and find what other vectors added together produce it. In most cases, this involves determining the perpendicular components of a single vector, for example the x - and y-components, or the north-south and east-west components.