Consider a compound pendulum pivoted about a fixed horizontal axis, illustrated by the force diagram on the right:
Okay, I can't figure out where the normal force on the pendlum should point (this force isn't indicated in the diagram).
On the one hand, I think it should point in the same direction as the tension force on the left-side diagram, in order to produce the rotation. But on the other hand, shouldn't the normal force point towards the pendulum rather than away from it? In any case, I know that normal face is perpendicuar to the contact surface, but how does "contact surface" fit into the context of this scenario?
Please help me understand the concepts involved.