1. The problem statement, all variables and given/known data A rope is tied to a log of mass m = 99.9 kg. When you pull on the rope with a horizontal force of magnitude F = 688 N, the log moves at constant velocity. a) Find f, the magnitude of the resistive (frictional) force acting on the log. You may assume the frictional force acting on the log is constant. b) Find the magnitude of the horizontal force F needed to pull the log with an acceleration of magnitude a = 5.42 m/s2. Assume the resistive force is the same as in part a. 2. Relevant equations F = ma 3. The attempt at a solution I'm actually stuck on the fact that the problem says that when we pull with a force of 688N, the log moves at constant velocity. Wouldn't that mean that there is (a) no friction, and (b) acceleration = 0? Obviously I'm wrong, but that's how I'm interpreting it, and I sort of have a mind block that won't let me get around it. Even if we solve for acceleration, F = ma 688N / 99.9 kg = 6.8869 m/s2 Would we have to find a frictional force that would make this acceleration 0 and the velocity constant?