The 480-N force is applied to the 90-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left. H₂ = 0.73 Hk = 0.49 Answer: F= the tolerance is +/-2% N 34° P = 480 N