Here's an interesting Q on Friction.  

Mr. Bean moves the 35 Kg box up a ramp inclined at 12° with the horizontal. If the box starts from rest at the bottom of the ramp and is pulled at an angle of 25° with respect to the incline with a force of 185 N, what is the acceleration up the ramp? Assume that the coefficient of kinetic friction is 0.27 .

Try to prove . . . 
Answer: 0.92 m/s2

source: Holt Physics

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