Hydraulic conductivity (Falling-head method)
Bradley model of the force applied on a contact area between two spheres
Electric charge density displacement
Oblique Shock
Heat transfer coefficient of pipe wall (using wall thickness)
Capstan equation ( belt friction equation)
Admittance (related to resistance and reactance)
Infiltration
FPM to CFM Calculator
Torque to lift a load (by a lead screw - related to the coefficient of friction)