Need help please with pushing a block question

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Homework Help Overview

The discussion revolves around a physics problem involving a block being pushed and pulled, where the original poster seeks to determine the coefficient of friction (μ) and the acceleration of the block. The problem includes parameters such as the force applied, the angle of application, and the weight of the block.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster describes their attempts to analyze the forces acting on the block, noting confusion due to having two unknowns in their equations. They question whether they are missing something in their approach. Other participants suggest clarifying the problem statement and provide insights into the relationship between the forces and friction.

Discussion Status

Some participants have provided guidance on the relationships between the forces and friction, indicating a productive direction. The original poster is encouraged to clarify the problem details further, which may help in resolving their confusion.

Contextual Notes

The original poster mentions that the homework site is down, limiting their ability to provide the complete problem statement. They are working with partial information regarding the force, angle, and weight of the block, which may affect their analysis.

hisoko
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http://img94.imageshack.us/img94/5889/physics.jpg

so I completely drew my work, as you can I need to find out the coeffiect of mu and the acceleration of the block. I did the Y and X forces and am stuck, because I have 2 unknowns with the X formula even if I sub in the Y into it. Am I doing somthing wrong or missing somthing here? Thanks for your help :)
 
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Your approach is correct. Post the exact text of the problem.
 
The site is down for my homework assignment, but that is indeed all they gave me, they only told me the force that is pushed against the block, the angle, and the weight of the block(1000N) and I am to find mu and acceleration of the block, They then say what is the acceleration of the block if you pull it with the same force and angle, using the same mu from the push. Ill post the question as soon as the site is back up
 
Now it is clear. Block will just start moving when frictional force fr is equal to F*cos20.
Now μ = fr/N. You know N and fr. Find μ.
When you pull the block with the same force, you can see that the normal force decreases.
 

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