Homework Help: physics

Posted by Jessi on Sunday, September 13, 2009 at 5:47pm.

A block sits against a vertical wall and a 120 lb force P acts diagonally to the left on the block at an angle below the horizontal. Determine the magnitude and direction of the friction force which the vertical wall exerts on the 100 lb block if theta is (a)15 degrees (b)30 degrees

For part a I got that the answer is 46.36 lb up but I can't get part b to work correctly.

physics - drwls, Sunday, September 13, 2009 at 6:36pm
You have provided incomplete information.

Were you given a value for the coefficient of friction? From what direction is theta measured?
physics - Jessi, Sunday, September 13, 2009 at 10:58pm
yeah the coefficient of static friction is 0.5 and coeffient of kinetic friction is 0.4. theta is measured below the horizontal

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