Which of the following statements is correct about friction?

Physics Newton's Laws of Motion Second Law of Motion MCQ (Single Correct)

The coefficient of friction between a given pair of substances is largely independent of the area of contact between them

The frictional force can never exceed the reaction force on the body from the support surface

Rolling friction is only slightly smaller than sliding friction

The main source of friction is the irregularity of the surfaces in contact

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The correct answer is:

: The coefficient of friction between a given pair of substance is independent of the area of contact between tem. for copper on cast iron.

Rolling friction is much smaller than sliding friction; Irregularity of the surface in contact is not a main contributor of friction.

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