How Does Force Applied to One Vertex Affect Opposite Vertex in a Square Frame?

AI Thread Summary
The discussion revolves around the dynamics of a square frame made of four rods connected by frictionless hinges, specifically analyzing how a force applied at one vertex affects the opposite vertex. When a horizontal force is applied to vertex P, it causes vertex Q to accelerate, and participants explore the relationships between the accelerations of various points in the frame. Key concepts include the need for free body diagrams to visualize forces acting on each rod, the symmetry of the system, and the equations of motion derived from these forces. Participants also discuss the role of normal forces at the junctions and how they influence the motion of the rods. Ultimately, the conversation emphasizes understanding the mechanics of interconnected systems under applied forces.
  • #51
wrobel said:
because that what you use is not the Least Action Principle

But in that case, what is being used instead that is causing the right answer to be produced with this method?
 
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  • #52
wrobel said:
because that what you use is not the Least Action Principle
Umm.. that doesn’t explain why it gives the right answer. I could have used any number of things that are not the least action principle. I find it hard to believe it is just coincidence. Have I chanced upon some other (named) principle?
 
  • #53
I do not think that argument like "right answer" can prove anything by itself
 
  • #54
wrobel said:
I do not think that argument like "right answer" can prove anything by itself
No, but it is strongly suggestive after it worked in two cases.
 

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