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    Question

    When milk is churned, the cream separates from it clue

    to:
    A Frictional force Correct Answer Incorrect Answer
    B Centrifugal force Correct Answer Incorrect Answer
    C Gravitational force Correct Answer Incorrect Answer
    D Viscous forces Correct Answer Incorrect Answer

    Solution

    The extraction of cream happens because of the work of centrifugal force which works outward. The separation of cream from milk is based on the fact that when liquids of different specific gravities revolve around the same centre at the same distance with the same angular velocity, a greater centrifugal force is exerted on the heavier liquid than on the lighter one. Milk can be regarded as two liquids of different specific gravities, the serum and the fat.

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