This is how I solved this friction problem

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Homework Help Overview

The discussion revolves around a physics problem involving a block pressed against a wooden wall, analyzing the forces acting on the block to determine its motion. The block has a mass of 1 kg and is subjected to a force of 12 N at a 20-degree angle. Participants are exploring the implications of friction in this context.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the net force acting on the block and question whether friction coefficients for wood should be considered. There is uncertainty about how to apply kinetic and static friction in relation to the block's vertical movement.

Discussion Status

The conversation is ongoing, with participants providing suggestions for drawing free-body diagrams to visualize the forces involved. There is acknowledgment of the need to incorporate friction into the analysis, but no consensus has been reached on the correct approach.

Contextual Notes

Participants note that the coefficients of friction for wood are not provided in the problem statement, leading to questions about their relevance and application in the solution.

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Homework Statement



Wooden wall & block. Block=1kg. Block is pressed against the wall by force of 12N's on its lower edge from horizontal 20 degrees.

Will the block stay, go up, or slide down

Homework Equations





The Attempt at a Solution



Fnet = 12xsin30 - 9.8x1kg = -3.8

so block will slide down

should I have used wood friction constants too?

I don't know how to apply wood Uk Us. The block is press hozintally how would kinetic and static frictions affect vertical movement
 
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SELFMADE said:

Homework Statement



Wooden wall & block. Block=1kg. Block is pressed against the wall by force of 12N's on its lower edge from horizontal 20 degrees.

Will the block stay, go up, or slide down

Homework Equations





The Attempt at a Solution



Fnet = 12xsin30 - 9.8x1kg = -3.8

so block will slide down

should I have used wood friction constants too?

I don't know how to apply wood Uk Us. The block is press hozintally how would kinetic and static frictions affect vertical movement


Hey there SELFMADE :smile:

Perhaps you could post the enire question as it was stated? I am a little confused about what is being asked.

Were you given values of U_k and U_static in the problem?
 
Is it clear now?

http://img198.imageshack.us/img198/7676/pfsb.png

U_k and U_s aren't given but I figure since a table of coefficients was given in the chapter and problem specifically states "wood" it must be used.
 
Last edited by a moderator:
Ok. The problem with your approach is that no, you did not include the effects of friction.

I suggest that you draw a free-body diagram with all of the forces that are acting on the block.
 

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