Torque Equilibrium: Solving f=ma and T=rf

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Homework Help Overview

The discussion revolves around the concepts of torque and equilibrium in a physical system involving a bar and attached masses. Participants are exploring the relationship between forces, torques, and the conditions for rotational equilibrium.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants are attempting to understand how to visualize the model of the bar and the forces acting on it. Questions are raised about the role of the bar's weight and the positions where forces must be applied for equilibrium. There is also a discussion about the contribution of mass versus force in calculating torque.

Discussion Status

The discussion is active, with participants sharing insights and seeking clarification on the relationship between forces and torques. Some guidance has been offered regarding the calculation of torques and the importance of selecting an appropriate origin for analysis.

Contextual Notes

There appears to be some confusion regarding the definitions and roles of forces and masses in the context of torque. Participants are also navigating the requirements of the problem as it pertains to homework constraints.

rphung
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Homework Statement



Untitled-7.jpg


Homework Equations


f=ma
T=rf


The Attempt at a Solution



i can't really visualize the model of the bar. But isn't the force needed to balance out the bar, just the sum of the weight of the bar, and the two masses on the left and right?
 
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Sure it is. I assume next they will ask where that force must be applied so the bar is in rotational equilibrium as well. Then you need the torques.
 
yeah that is the next question. Do you have any pointers on this one? How does the mass of the bar contribute to the torque?
 
rphung said:
yeah that is the next question. Do you have any pointers on this one? How does the mass of the bar contribute to the torque?

Only forces contribute to the torque, not masses. Just pick an origin, add them up, set to zero and solve for the unknown position.
 

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