Statics of Rigid Bodies Chapter V Friction Prob 1 Part I (Philippines)

Part I Statics of Rigid Bodies
Chapter V Friction
Problem 1
A 150 lb block is in contact with the plane at 25 degrees with the horizontal. A force is applied parallel to the plane acting upward. If the coefficient of friction is 0.18, determine the following:
A. Magnitude of P to just cause motion impend up the plane;
B. Magnitude of P to just cause motion impend down the plane;
C. If P=75 lb, determine the magnitude and direction of the frictional force.

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