Finding Force Needed to Climb Wall: Friction Coefficient u & Angle @α

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paras02
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Homework Statement


A man standing in the corner of the wall tries to climb up
by pushing against both the walls, if the friction coefficient between the wall and his elbow is 'u' , then find the minimum force from which the man must push against in order to climb up the wall, given that he is pushing the wall at an angle @ ( alpha )?



Pls help me with the direction in which friction and all other forces are acting...
 

Discussion

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What kind of friction is involved here: static or kinetic?
 
I think it's fair to assume static or at least static = kinetic, else the man has a serious problem.
 
So friction always acts along a surface - so sketch one of the surfaces and put an arrow on it indicating which way the man is pressing (at an angle remember). Which way does the static friction have to act to stop the man from sliding?