Rod is toppling. Find reaction force as a function of theta

AI Thread Summary
The discussion focuses on calculating the reaction force of a rod toppling from a vertical position as a function of the angle theta. Participants express confusion about solving the problem, particularly regarding the application of rigid body motion and Lagrangian mechanics. The importance of understanding constraint forces and Lagrangian multipliers is highlighted as essential for deriving the equations of motion. There is a consensus that the problem relates to concepts covered in class, despite the difficulty experienced during the exam. Overall, the conversation emphasizes the need for a solid grasp of mechanics principles to tackle such problems effectively.
NucEngMajor
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Homework Statement


Rod of length b and mass m topples from vertical position at theta = 0. Calculate the reaction force f as a function of theta. What is the minimal and maximal values of f for theta between 0 and pi

Homework Equations


Third law?[/B]

The Attempt at a Solution


I never really worked a problem such a this in mechanics. So I was shocked to see this on my exam. I would like to know what the solution is. I had no idea how to solve. I suppose this falls under rigid body motion, but all we worked in that topic were lagrangians...
 
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can the rod slip on the ground?
 
NucEngMajor said:
I suppose this falls under rigid body motion, but all we worked in that topic were lagrangians...
In general, exam questions are related to the material that's been presented. So you wrote a Lagrangian for this constrained system and found the equation of motion. Did you also learn that the constraint forces follow from the Lagrangian multipliers ?
 
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