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Coefficient of Friction

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Rookie
Karma Points: 0
Respect (66%):
Date Posted: 2/8/2008 8:58:01 PM  Status: Closed
Coefficient of Friction
Course Textbook Chapter Problem
General Physics N/A N/A N/A
Question Details:
A 50kg mass w/ an initial velocity of 30 m/s slides to a stop in 100m.  What is the coefficient of friction?

So far I have:  d=v^2/2gμ
                      100m=900/19.6μ

is this correct?  Also if so, how would I continue from there, I'm kind of lost. Thank you!

Answers:

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Oracle
Karma Points: 10,131
(CSU Long Beach)
Date Posted: 2/8/2008 9:02:45 PM  Status: Live
Asker's Rating: Lifesaver   
Response:
Fl7675's Comment:
thanks!
I rarely give answers.  I try to provide solutions.

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Guru
Karma Points: 2,488
Date Posted: 2/8/2008 9:08:08 PM  Status: Live
Asker's Rating: This answer has not been rated. If you asked this question, then please login.   
Response:
I'll use here the Energy Method:
KE = Wfric
(1/2)mv2 = μmgd
μ = v2 / 2gd
    = 302 / 2(9.8*100)
    = 0.459183673 or 0.46

Yes, what you did is correct. To finish it:
d = v2 / 2gμ
(2gμ)d = v2
μ = v2 / 2gd
then substitute the given values and you'll get the same answer. I hope this helps.. ^__^
 Smile! Don't die by drowning in your studies, rest a bit every now and then, and don't forget to smile! -ζ ι δ



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