1. The problem statement, all variables and given/known data So a hot wheel was put on a linear track, and one end of the track is slowly lifted until the cart starts to move. The height of the one end is measured as 6.45cm and distance (or hypotenuse) is 189.5cm mass of hot wheel is 45.7 g 2. Relevant equations PE = mgh KE = 1/2mv2 Wf = Ffd Ff = μmg 3. The attempt at a solution So I was thinking of using PE = KE + Wf, but the car doesn't move, so I can't have KE in there. If that's the case, do I just set up the equation as PE = Wf ???? and find the coefficient of static friction from there?