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Friction

There are two kinds of friction, which depend on the state of the object.

For objects in static state we have:
Ff = μsN

For objects in motion we have:
Ff = μkN

Where
μs: coefficient of static friction
μk: coefficient of kinetic friction
N: the force on the surface, which can be determined by using: N = mgcosθ

Where we have:
m: mass of the object on the surface
g: the strength of the gravitational field
θ: the angle of the surface


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