Posted by Leanna on Sunday, March 3, 2013 at 4:24pm.
(23kg)(9.8m/s^2)(cos(38)) = 177.6N
You do not say if the child is going at constant speed or alternatively what the coef of friction is. You also do not say what the question is.
All I can say is
normal force = 23 * 9.81 * cos 38 = 178 N agreed
force down slide = 23 * 9.81 * sin 38 = 139 N
force up slide = 178 * mu
so
23 a = 139 - 178 mu
if a = zero, you can solve for mu
if you know mu, you can solve for a
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