The Free Body Diagram ■■ Consider the following case What are the forces acting on the plank? plal ank F= floor W= wall WP E earth PF PE EP EP Physics 121: Lecture 8, Pg 8Physics 121: Lecture 8, Pg 8 The Free Body Diagram... Consider the following case What are the forces acting on the plank ? P = plank F = floor W = wall E = earth FW,P FP,W FP,F FP,E FF,P FE,P