Part 1 and part 2 are rigidly attached eg welded to each oth

Part 1 and part 2 are rigidly attached (e.g., welded) to each other. Part 1 could be subjected to a variety of forces applied at different points Consider the loads exerted by part 2 on part 1 as they would appear in a free body diagram of part 1. The pin is frictionless. Which is the most appropriate partial free body diagram for the loads exerted by part 2 on part 1? The loads should be appropriate whatever the other forces on part 1.

Solution

Option (a) will be most appropriate partial free body diagram for the loads exerted by part 2 on part 1 as it will have torsion and tension forces as shown.