Coefficient of Kinetic Friction Question

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Homework Help Overview

The discussion revolves around determining the coefficient of friction necessary to prevent slippage between two boxes experiencing acceleration. The subject area involves concepts from dynamics and friction.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to relate acceleration to the coefficient of kinetic friction using equations of motion and friction. Some participants question whether the coefficient of static friction should be considered instead, leading to a discussion about the differences between static and kinetic friction.

Discussion Status

The discussion is actively exploring the distinction between static and kinetic friction, with participants providing guidance on the relevance of static friction in the context of preventing slippage. There is acknowledgment of the original poster's approach, but also a suggestion to reconsider the type of friction being applied.

Contextual Notes

Participants note the importance of using the correct coefficient of friction based on the context of the problem, indicating a potential misunderstanding regarding static versus kinetic friction.

wilson_chem90
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1. If the acceleration of a pair of boxes has a magnitude of 2.5m/s^2, determine the smallest coefficient of friction between the boxes that will prevent slippage.



Homework Equations


F = ma
Fk = ukFn
Fw = mg


The Attempt at a Solution



ma = uk mg(Fn)
a = uk g
a/g = uk
2.5m/s^2 / 9.8m/s^2 = uk
uk = 0.25
 
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Since you don't want it to slip, it's really the coefficient of static friction you are interested in, but as to your solution, that looks like the right method.
 
oh okay, so its the same format just static friction?
 
wilson_chem90 said:
oh okay, so its the same format just static friction?

Correct.

μs not μk

No big deal.
 

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