what is the formula of friction
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Friction force
f = \mu N
f = friction force
\mu = coefficient of friction
N = normal force
FROM THE WEB
Calculate the force of friction using the formula: F = μN. Where N is the normal force and μ is the friction coefficient for your materials and whether they're stationary or moving. The normal force is equal to the weight of the object, so this can also be written: F = μmg.
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For most purposes, you can use the formula F = μN to calculate friction, with N standing for the “normal” force and “μ” incorporating the characteristics of the surface.
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