Free Body Diagrams, Tutorials with Examples and Explanations Example 8 : A system with two blocks, an inclined plane and a pulley. A) free body diagram for block m 1 (left of figure below) 1) The weight W1 exerted by the earth on the box. 2) The normal force N. 3) The force of friction Fk. 4) The tension force T exerted by the string on the block m1. B) free body diagram of block m 2 (right of figure below)