Physics
When the milk is churned vigorously the cream from it is separated out due to

Frictional force
Centrifugal force
Centripetal force
Gravitational force

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Physics
Railway tracks are banked on curves so that

Necessary centripetal force may be obtained from the horizontal component of the weight of the train
The train may not fall down inwards
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train
No frictional force may be produced between the tracks and the wheels of the train

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