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Understanding μk 
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#1
Jan1314, 05:49 PM

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I'm currently a first year physics student and missed some nets and concepts and need help before exams. It would be a HUGE help if someone could explain it to me and how to use it to find things like Fn and a→ when mass and μk is given. Please i really could use this info and thanks.



#2
Jan1314, 05:56 PM

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Welcome to PF;
By ##\mu_k## do you mean the coefficient of kinetic friction? It's used the same way as any coefficient of friction. You use friction as an additional force in the freebody diagram. People tend to trip up on the direction (it changes if the velocity changes direction) and on the transition between kinetic and static cases. See: http://hyperphysics.phyastr.gsu.edu/hbase/frict.html Hyperphysics appears to repeat an "obsolete idea" about friction re surface roughness. See: http://amasci.com/miscon/miscon4.html#fric ... does not affect the calculation though. 


#3
Jan1314, 06:15 PM

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yeah i was talking about it as as a coefficient of friction kinetic friction and thanks for the help!



#4
Jan1314, 06:20 PM

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Understanding μk
I'm impressed you were able to decode that, Simon! I didn't have a clue what the OP was asking...



#5
Jan1314, 06:52 PM

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@T_razz: no worries, do some examples and let me know if you get stuck.
@berkeman: experience :D I need to edit my original reply slightly though: the coefficient is not the force. I'm sure nobody got confused... 


#7
Jan1414, 07:47 PM

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I dunno  lets see... ummmm... I'm picking up an impression of a square or rectangle of light in front of you... also a general blockyness like an ordered cubism regularly under your hands.
There's another in the background  it's fuzzy  associated with the letter D or C. Does this make any sense to you? 


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