1. The problem statement, all variables and given/known data I am wondering if anyone knows of a document that shows derivations of specific values in Physics? For example, I need to find μs and am given the distance traveled and time (1.2 km in 17 sec). 2. Relevant equations I know the equation for μs, Ffriction=μs⋅FN. 3. The attempt at a solution I can use this to calculate velocity, etc., but I am at a loss of how to proceed and my text book doesn't have an example. Mastering Physics doesn't provide a "walk me through a similar problem" feature.