The problem states: An 800N box rest on a surface inclined 30 degrees. If a force 200N parallel to the surface is applied, the box will not slide down the incline. Whats the greatest force that can be applied to the box before it starts sliding up the incline?? I know Fnorm=mg*cos theta Fnorm=692.8N Is the mu=0.298 because Ffriction=mu*Fnorm ---> 200N=mu*692.8N I also know Fparallel=mg*sin theta Fparallel= 400N How do I find Fnet??? I don't know what to do from there!! Can anybody help??!! Please and thank you!!