Posted by physics on Wednesday, August 12, 2009 at 5:12pm.
The coefficient of kinetic friction will not change, but the different inclines will change the magnitude of the normal force perpendicular to the slope/ramp.
Assuming that no other forces act on you while you are walking down the slope/ramp, a free body diagram will show that the normal force has the same magnitude as the component of the force of weight perpendicular to the slope/ramp.
Now you realize that going up slopes is dificult, one looses "footing" and slips. What is happening is that Weight is not normal to the slope, and friction depends on the normal component.
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