10-20 A 50-cm x 30-cm x 20-cm block weighing 150 N is to be moved at a constant velocity of 0.80 m/s on an inclined surface with a friction coefficient of 0.27. (a) Determine the force F that needs to be applied in the horizontal direc- tion. (b) If a 0.40-mm-thick oil film with a dynamic viscos- ity of 0.012 Pa's is applied between the block and inclined surface, determine the percent reduction in the required force. 50 cm 150 N 20⁰ 30 cm V= 0.80 m/s

10-20 A 50-cm x 30-cm x 20-cm block weighing 150 N is to be moved at a constant velocity of 0.80 m/s on an inclined surface with a friction coefficient of 0.27. (a) Determine the force F that needs to be applied in the horizontal direc- tion. (b) If a 0.40-mm-thick oil film with a dynamic viscos- ity of 0.012 Pa's is applied between the block and inclined surface, determine the percent reduction in the required force. 50 cm 150 N 20⁰ 30 cm V= 0.80 m/s