Coplanar equilibrium (mechanics)

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Homework Help Overview

The discussion revolves around a mechanics problem related to coplanar equilibrium, specifically focusing on analyzing forces and moments acting on a roller as depicted in a free body diagram.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the initial setup of the problem, including the use of a free body diagram. There are questions about the correct application of equilibrium equations and the handling of moments. Some participants express uncertainty about their understanding of the concepts involved.

Discussion Status

Participants are actively engaging with the problem, with some providing initial equations based on their interpretations. There is a recognition of potential errors in the setup of the equations, and guidance is being offered regarding the principles of equilibrium.

Contextual Notes

There is a mention of the need for clarity on the forces acting on the roller and the correct orientation of the coordinate axes in relation to the incline. Some participants express a lack of familiarity with the concepts of moments and equilibrium.

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Since you have a free body diagram in the picture, you should have an idea of where to start. :smile:
 
uhmmm, that's the problem..im really not that familiar with moments and stuff.. could you give me a hint? plsssss...
 
kring_c14 said:
uhmmm, that's the problem..im really not that familiar with moments and stuff.. could you give me a hint? plsssss...

OK, which forces are acting on the roller?
 
well what I did was this one[tex]\sum Fx= Pcos20-Nsin20-Fsin70=0[/tex]
[tex]\sum Fy=P sin20+Ncos20-Fcos70-120=0[/tex]

then, i don't know what to do...
 
kring_c14 said:
well what I did was this one[tex]\sum Fx= Pcos20-Nsin20-Fsin70=0[/tex]
[tex]\sum Fy=P sin20+Ncos20-Fcos70-120=0[/tex]

then, i don't know what to do...

If the x-axis is along the incline (which is visible from the FBD), the your equations are not correct.
 
so how do I make it right?
 
kring_c14 said:
so how do I make it right?

Well, since we're talking about equilibrium, sum up the forces in the x and y directions, and set them equal to zero.
 

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