posted by Anonymous .
A 3.66 kg block is placed on an inclined surface that makes an angle of 18.5° relative to horizontal. The coefficients of static and kinetic friction between the block and surface are 0.534 and 0.239, respectively. The block remains at rest when released. What is the magnitude of the static frictional force acting on the block?
F(fr) = k(st) •N = k(st)•m•g•cosα