Friction SAMPLE PROBLEM 2

In this second sample problem solution, watch as I make another classic physics problem solving mistake by not focusing on the signs of my variables until the very end. Bad physicist. Do not do what I do here and make sure to fill in your signs as you go along. Other than that, the approach taken is very similar to the approach outlined in the “how to solve a frictional force problem” but we are being asked to solve for the coefficient rather than the acceleration.