Help with question on forces with motion, tension, friction

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Homework Help Overview

The discussion revolves around a problem involving forces, motion, tension, and friction, as presented in an image linked by the original poster. The context suggests a scenario where multiple objects are interacting, likely on an incline, and the original poster expresses uncertainty about how to approach the problem.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants inquire about the coefficient of friction and the assumptions made regarding its presence. The original poster mentions uncertainty about where to start and questions the validity of their equations, particularly regarding the role of tension and friction in the system.

Discussion Status

Some guidance has been offered regarding the equations used by the original poster, with suggestions to reconsider the relationship between tension, weight, and friction. There is an ongoing exploration of the implications of the assumptions made about friction and the conditions under which the system operates.

Contextual Notes

The original poster notes that they are working with limited information, specifically regarding the coefficient of friction, which is not provided in the problem statement. This lack of information is influencing their approach to the equations and assumptions about the system's behavior.

shadowofanub
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Homework Statement


http://img253.imageshack.us/my.php?image=workshownph1.jpg


Homework Equations



The equations and the problem, along with the attempt at a solution are shown in the picture above

The Attempt at a Solution



The attempt is in the picture as well. Thanks guys for looking at it and helping out in advance. I have no idea with these sorts of problems where to start or what I am doing wrong.
 
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shadowofanub said:

Homework Statement


http://img253.imageshack.us/my.php?image=workshownph1.jpg

Homework Equations



The equations and the problem, along with the attempt at a solution are shown in the picture above

The Attempt at a Solution



The attempt is in the picture as well. Thanks guys for looking at it and helping out in advance. I have no idea with these sorts of problems where to start or what I am doing wrong.

Welcome to PF.
What are you given for the coefficient of friction?
 
LowlyPion said:
Welcome to PF.
What are you given for the coefficient of friction?

Thanks, its good to be here. Unfortunately all i am given is what is shown in the picture. I just assumed there was friction since it didn't say there wasn't... that's why its in my equations.
 
shadowofanub said:
Thanks, its good to be here. Unfortunately all i am given is what is shown in the picture. I just assumed there was friction since it didn't say there wasn't... that's why its in my equations.

Your equations are inaccurate. The tension must allow for the weight of both box and sled as the sinθ from the incline.

There should be a μ*m*g*cosθ between the box and the sled. When acceleration of the combined system exceeds that then it will slip. But not knowing that μ ... if it was frictionless on the sled it would slide with any tension on the rope.
 

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