Problem: Ive been assigned a problem that involves a block on a table that is attached by a string to a block hanging over the edge. They are of different masses, and I am given coefficients for both static and kinetic friction. The former is .50, and the latter is .30. I have to find the acceleration of the system if it is released from rest. My problem: ok, so do I need to use the coefficient of kinetic friction at all? I do not think so...that's pretty much my question.