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Homework Help: Friction and acceleration

  1. May 15, 2008 #1
    [SOLVED] friction and acceleration

    A 2kg block(a) and a 5kg block(b) are on an inclined plane of 20degrees.
    Coefficient of kinetic friction 0.4
    Coefficient of static friction 0.4
    Calculate the size of mass M (a third mass attached to (b) by rope and pulley system)

    The attempt at a solution
    (a) fx=ma=-2g sin20 +Ff (Ff=o.38)
    :- a= -3.16
    fy=0=-2g cos20 +N
    :- N= 2g cos20
    = 0.94

    (b) fy=0=-5g cos20 -0.94+N (Ff=18.79)
    :- N= 46.98
    fx=ma=T-0.38-18.79-5g sin20
    :- a= (T-35.93)/5

    (c) fx=ma=mg+T
    :- a= g+T

    How do I use this working out to find tension in rope(T)?
  2. jcsd
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