Friction Force Calculator Friction Force Calculator Evaluate static vs. kinetic friction and determine surface-level mechanical motion state. Material Pair (Presets) Custom Settings Rubber on Concrete (Dry) Wood on Wood Ice on Ice Steel on Steel Rubber on Wet Road Mass (kg) Static μ (μs) Kinetic μ (μk) Incline Angle (°) Calculate Friction Normal Force– Gravity Parallel– Max Static (fs)– Kinetic (fk)–