The discussion revolves around determining the direction of the normal force exerted on an object (B) in contact with a rod. The context involves mechanics, specifically the behavior of forces in contact scenarios where friction is absent.
The discussion is ongoing, with participants providing references and clarifications regarding the normal force's behavior in point contact scenarios. Some guidance has been offered, but there is still uncertainty regarding specific conditions and interpretations of the normal force at the edges of the rod.
Participants note the absence of hints in the original problem statement and express confusion about the definitions and implications of normal force in relation to the rod's orientation and contact points.
See if section 1 of https://www.physicsforums.com/insights/frequently-made-errors-mechanics-friction/ helps.Faiq said:
I do not understand your response. That section tells you how to figure out the direction of the normal force in a point contact like the one in this question. Isn't that what you wanted to know?Faiq said:
No, it would move exactly as the rod moves and remain perpendicular. Why not?Faiq said:
Yes. It follows from the definition of normal force that I give at the start of the section.Faiq said:
It will not apply at the tips, no, because there is no well-defined contact plane there. Generally you will be able to figure out the contact plane from what the tip touches, as in the question above where it rests in the bowl.Faiq said: