To start: I need the integral of the force on a sphere resulting from equal impact from all directions simultaneously. This, of course, is zero. Then second: Two spheres each in the same force environment being impacted on all sides, leaving a shadow of this force ,on the other. How do you represent the resulting net force on each sphere at varying distances? I`ve been trying to work this out but it`s been 40+ years since I worked with integrals in school.