A-Level Maths | Friction Last updated on 07 Jan 2026 FrictionFriction = μRμ: coefficient of friction (always between 0 and 1)R: normal contact force (always perpendicular to surface e.g. floor/ wall)Question 1Question 2Question 3Question 4 Previous AS-Level Maths Test | Differentiation | OCR MEI Next Tutoring advice for struggling students