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posted by  hu27 on 11/4/2009 7:27:22 PM  |  status: Live  |  Earned Karma: 0

I don't understand how to solve part b

Course Textbook Chapter Problem Needs by
Algebra Based Physics Physics (4th) by Walker 6 77GP 11/6/2009 at 11:00:00 PM
Question Details:
A 13-g coin slides upward on a surface that is inclined at an angle of 12° above the horizontal. The coefficient of kinetic friction between the coin and the surface is 0.23; the coefficient of static friction is 0.35. Find the magnitude and direction of the force of friction under the following circumstances. (a) when the coin is sliding down the incline (b) after it comes to rest up the incline

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posted by chrisjericho on 11/5/2009 4:20:41 AM  |  status: Live
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Response Details:

given

mass of the coin = m = 13g = 13 * 10-3 kg
  μs = 0.35
 inclined angle = θ = 120
  when it come to rest , then static friction comes  into play
        fs = μs N
            = μs mg cos12
             = 0.31 *13 * 10-3 kg * 9.8 m/s2 * 0.97 = 3.83*10-2 N
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