Coefficient of Friction Question

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Homework Help Overview

The discussion revolves around the relationships between static, kinetic, and rolling friction coefficients. Participants are exploring the properties and comparisons of these types of friction in a physics context.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the expected order of the coefficients of friction and whether static should always be less than kinetic and kinetic less than rolling. There is also a discussion about the conditions under which these types of friction occur.

Discussion Status

The discussion is ongoing with participants expressing different views on the relationships between the coefficients. Some have provided explanations of the types of friction, while others are questioning the assumptions behind their comparisons.

Contextual Notes

There appears to be some confusion regarding the expected hierarchy of the friction coefficients, and participants are seeking clarification on this topic.

JWest
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What is the relationship between static, kinetic, and rolling? Is static supposed to be less than kinetic and kinetic less than rolling? Can someone help me out?
 
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If there's no friction, an object can't roll.

Static friction occurs when the object stops moving, i.e. when the force provided by friction cancels out the net-force.

Kinetic friction occurs when the object continues moving with decreasing acceleration due to friction until it eventually comes to rest.
 
What I'm asking is should the static coefficient of friction always be less than the kinetic and the kinetic always be less than rolling?
 
rolling < kinetic < static
 

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