1. The problem statement, all variables and given/known data A 2.5 kg block is initially at rest on a horizontal surface. A horizontal force F of magnitude 6.0 N and a vertical force P are then applied to the block. The coefficients of friction for the block and surface are us = 0.40 and uk = 0.25. Determine the magnitude of the frictional force acting on the block if the magnitude of P is (a) 8 N (b) 10 N (c) 12 N 2. Relevant equations fk = UkN N = mg 3. The attempt at a solution part (a) N = 2.5kg*9.8m/s2 = 24.5 N So, fk = 0.25*24.5 N = 6.125 But the answer to part (a) was 6.0, not 6.125... It feels like I'm quite a bit off track. Could someone give me a little step forward on part (a)?