Rigid Body Equilibrium Question

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Homework Help Overview

The discussion revolves around a rigid body equilibrium problem involving tension in cables and forces exerted on a strut by a pivot. The original poster expresses confusion about determining the force exerted on the strut by the pivot and seeks clarification on this concept.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants suggest drawing free body diagrams for each joint to visualize forces. The original poster questions how to determine the net force on the pivot and seeks easier methods to conceptualize this force.

Discussion Status

Some participants are actively engaging by reiterating the importance of free body diagrams, while the original poster is focused on understanding the specific forces involved. There is an ongoing exploration of the forces at play, particularly regarding the pivot and the upper right connection of the strut.

Contextual Notes

The original poster notes a lack of clarity regarding the pivot's location and its role in the equilibrium of the system. There is also mention of needing to find forces in other related problems, indicating a broader context of learning about rigid body equilibrium.

aldee11
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Hi, I have a question regarding Equilibrium problems.
Here is the example of my hw.
Find the tension T in each cable and the magnitude and direction of the force exerted on the strut by the pivot.
I know how to find T. The only problem is i couldn't imagine the force exerted on the strut by the pivot. I don't even know what that means. Can someone explain it to me and help me solve this problem.

I also noticed that i need to find the force on the pivot for some other problems. Is there any easy ways to find the force? at least, how to picture it. Once i know where it is, i think i could solve it.
untitled-1.jpg
 
Last edited:
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nobody??
 
Draw a free body diagram for each joint.
 
TVP45 said:
Draw a free body diagram for each joint.

I know how to do it, the only problem is i don't know how to determine the net force on the pivot.
thats it. that's my only problem. I know how to solve T, but I don't know how to solve the net force exerted on the strut by the pivot
 
OK. The diagram does not show a pivot where the strut meets the wall, but I assume that is supposed to be a pivot? In that case the strut is always in either pure tension or compression since you cannot transmit torque at either end. So, the force exerted on/by the strut at the upper right (where the two cables are) must be balanced by a force at the pivot. Do you have that force at the upper right?
 
I need this force exerted by the wall.

untitled-1.jpg
 
Yes, I understand. Do you have the FBD solved at the upper right?
 

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