tell me the defination of friction
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Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.
Friction force
f = \mu N
f = friction force
\mu = coefficient of friction
N = normal force
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the resistance that one surface or object encounters when moving over another.
"a lubrication system which reduces friction"
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