How Does Friction Affect the Acceleration in a Pulley System?

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Homework Help Overview

The problem involves a pulley system with multiple blocks, where friction plays a role in the acceleration of the blocks. The scenario includes a 9.0-kg block on a smooth table and a 12-kg block on a rough surface, with a 5.0-kg block accelerating downward. Participants are exploring how friction affects the system's dynamics.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate the acceleration of the 5.0-kg block, expressing uncertainty about their method involving forces of friction and tension. Some participants affirm the approach, while others suggest referencing previous problems for guidance.

Discussion Status

The discussion includes affirmations of the original poster's calculations, though there is a note of confusion regarding earlier attempts. Participants are engaging with the problem without reaching a definitive consensus on the correct approach.

Contextual Notes

There is mention of a previous problem that may provide context or equations relevant to this scenario, indicating that participants are drawing on past discussions to inform their current understanding.

algar32
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Homework Statement



A system comprised blocks, a light frictionless pulley, and connecting ropes is shown in the figure. The 9.0-kg block is on a perfectly smooth horizontal table. The surfaces of the 12-kg block are rough, with \mu_k = 0.30 between the block and the table. If the 5.0-kg block accelerates downward when it is released, find its acceleration.

the figure looks like this picture (except M= 5kg):
http://www.cramster.com/answers-feb-11/physics/system-comprising-blocks-system-comprising-blocks-light-frictionless-pulle_1126069.aspx?rec=0

14 minutes ago
- 4 days left to answer.



Homework Equations





The Attempt at a Solution


I want to say it is 1.6 m/s^s but I am not sure If I did it right.
I just added the force friction to the force tension and then divided by the weights (9+5).
Not sure if this is correct or not.
 
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Looks right to me.
 
This is very similar to the earlier problem you asked.

Use those equations to find the answer :-)
 
tal444 said:
Looks right to me.

EDIT: I was doing this question wrong earlier, refer to emailanmol's posts in your other thread.
 

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