PROBLEM $6.$ Determine the smallest horizontal force P required to move the wedge to the right. The coefficient of static friction at all contacting surfaces is $0\mathrm{.}3.$ Set $=15$ and $F=100N.$ Neglect the weight of the wedge. Solution: $P=574N.$

PROBLEM $7.$ Knowing that the coefficient of static friction between the collar and the rod is $0\mathrm{.}40,$ determine the range of values of M for which equilibrium is maintained when $=60$ and $P=200N.($Hint: evaluate M for upward motion and then for downward motion$).$ Solution: $9\mathrm{.}38N-m$ and $15\mathrm{.}01N-m$

PROBLEM $7.$ Knowing that the coefficient of static friction between the collar and the rod is $0\mathrm{.}40,$ determine the range of values of M for which equilibrium is maintained when $=60$ and $P=200N.($Hint: evaluate M for upward motion and then for downward motion$).$ Solution: $9\mathrm{.}38N-m$ and $15\mathrm{.}01N-m$