Hi, I'm doing research on the Coefficient Of Friction using a forceplate. I'm trying to determine the coefficient by pulling several objects over the plate, and using the frictional force and normal force to determine the coefficient of friction (measured by the force plate). When I pull the object in a different angle in the vertical plane, does this effect the coefficient of friction? I know the coefficient is a constant, but how else would i go by determining it when the angle changes constantly? [PLAIN]http://www.roymech.co.uk/images11/friction.gif [Broken] In other words, when Fapp changes angle (upwards), how do i determine the coefficient of friction?