Are the sum of all forces written correctly for this system?

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Homework Help Overview

The discussion revolves around the setup of the sum of all forces in a physics problem involving forces acting on a system, likely in the context of dynamics or statics. Participants are examining the correctness of the force equations based on a provided diagram.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants are checking the setup of the sum of forces, with one noting a missing force component in the x direction. There is also a question regarding the angle used in the problem.

Discussion Status

Some guidance has been offered regarding the identification of forces, and a specific force component has been highlighted as missing. Additionally, a question has been raised about the angle used in the calculations, indicating ongoing exploration of the problem's assumptions.

Contextual Notes

There is a reference to the angle of 30 degrees, which may be a point of confusion or a critical aspect of the problem setup. The discussion also implies that the system may be in equilibrium, as indicated by the mention of constant velocity.

Blockade
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Member advised to use the formatting template for questions posted to the homework forums
Can someone check if my Sum of All Forces is setup correctly?

Problem:
7b189141b5.jpg


Diagram:
http://puu.sh/o6pLY/285d7b12c1.jpg

Sum of all Forces:
2e23f577b3.jpg
 
Last edited by a moderator:
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Blockade said:
Can someone check if my Sum of All Forces is setup correctly?

Problem:
[ IMG]http://puu.sh/o6pGI/7b189141b5.jpg[/PLAIN]

Diagram:
[ IMG]http://puu.sh/o6pLY/285d7b12c1.jpg [/PLAIN]

Sum of all Forces:
2e23f577b3.jpg
You're missing a force in Σ FxB, namely the component of weight in the x direction.
 
Last edited by a moderator:
SammyS said:
You're missing a force in Σ FxB, namely the component of weight in the x direction.

Σ FxB: -mgsin(30 degrees) + T2 - T1 - μkmgcos(30 degrees) = ma

Thank you.

and all ma = 0 since velocity is constant
 
By the way: Why 30° ?
 

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