Another concept my physics prof didn't teach the class. I would love to be able to attempt these problems but I have no idea what these concepts are or the formulas for them. I'm not looking for the answers to these problems here folks, but rather a method in which to solve them. Thanks! 1. A 750 N box moves at a constant velocity on a floor with a coeficient of static friciton of .800 and a coefficient of kinetic friction = .600. What is the horizontal force required to keep the box moving? All I can think to do here is draw a diagram with vectors, but I honestly have no idea what to do. 2. A 750 N box rests on hte floor with a coefficient of static friction = .800 and a coefficient kinetic friciton of 0.600. What is the force of friction if a horizontal force of 550 N is applied to the box? Again, no idea. 3. In order to slide a 70.0 kg box across the floor at a constant speed, you must push horizontally with a force of 351 N. What is teh coefficient of kinetic friciton?