μ
Friction Calculator
Friction force from the coefficient and the normal force, with the normal force worked out from a mass on a flat or sloped surface if you like.
Result…
How it's calculated
F = μ × N N = m × g × cos θ (on a slope)
Friction resists sliding and is roughly proportional to how hard the surfaces are pressed together (the normal force), not to the contact area. The coefficient μ depends on both materials and is found by experiment, so published values are approximate. On a slope the normal force falls with cos θ.
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