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Sliding Friction Calculator
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Quickly calculate sliding friction by entering the coefficient of friction and normal force. A free online kinetic friction calculator for physics and engineering.
For an object on a horizontal surface, N = m·g is used to calculate kinetic friction.
Common reference values: Steel-Steel 0.4-0.6; Wood-Wood 0.2-0.5; Rubber-Concrete 0.6-0.85; Ice-Ice 0.02-0.09.
Typically 9.8 m/s² on Earth's surface; 9.81 m/s² can be used for engineering estimates.
Formulas
Kinetic Friction: f = μ · N
Normal Force (Horizontal Surface): N = m · g
Normal Force (Inclined Plane): N = m · g · cos(θ)
Gravitational Component (Along Incline): F∥ = m · g · sin(θ)
This tool is based on classical mechanics, assuming the object is already sliding relative to the contact surface.
Negative net force along the incline means friction is greater than the gravitational component. The object will decelerate or remain stationary (further comparison with maximum static friction is needed).
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Do you often need to manually calculate sliding friction for physics studies or mechanical design? Based on the classic sliding friction formula f = μ × N, this tool allows you to instantly get accurate sliding friction values by simply entering the coefficient of friction and normal force, eliminating manual calculation errors and unit conversion hassles.
When entering values, please ensure both the coefficient of friction and normal force are pure numbers without unit characters. This tool assumes the normal force is in Newtons (N), and the result is output directly in Newtons. If your actual normal force uses units like kilogram-force (kgf), please convert it to Newtons first (1 kgf ≈ 9.8 N) before entering. The results apply only to sliding (kinetic) friction scenarios and do not cover static or rolling friction. All calculations are performed locally in your browser; your data is never uploaded, ensuring complete privacy. If invalid characters are entered, the page will prompt an error—please correct it and try again.
The magnitude of sliding friction is independent of the contact area and depends solely on the coefficient of friction and normal force—a physical law strictly followed by this calculator. Typical example: A box weighing 50 N is pulled horizontally across a wooden floor. If the kinetic friction coefficient between wood and wood is 0.4, the sliding friction is f = 0.4 × 50 = 20 N. In engineering estimates, you can use this tool to quickly verify if the driving force is sufficient to overcome frictional resistance. If you need to compare friction coefficients of different materials, we recommend consulting authoritative friction handbooks to select a reasonable μ value.
