Posted by garth on Thursday, June 7, 2012 at 8:27pm.
Given: Fs = 0.38, Fk = 0.28, m = ?.
Did you forget the mass?
Mass = 30kg(Assumed).
Wb = m*g = 30kg * 9.8N/kg = 294 N. =
Weight of box.
Fb = 294N @ 0 Deg. = Force of box.
Fp=294*sin(0)=0=Force parallel to floor
Fv = 294*cos(0) = 294 N. = Force perpendicular to floor.
Fn = Fp - u*Fv -u*Fv' = m*a. a = 0.
0 - 0.38*294 - 0.38Fv' = 0
-0.38Fv' = 0.38*294 = 111.72
Fv' = - 294 N.
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