First slide

Static friction

Question

Which of the following statements is correct about friction?

Moderate

A

Static friction depends on the area of contact
B

Kinetic friction depends on the area of contact
C

Coefficient of static friction does not depend on the surfaces in contact
D

Coefficient of kinetic friction is less than the coefficient of static friction

Solution

Both static and kinetic friction are independent on the area of contact Coefficient of static friction depends on the surfaces in contact
$∴ μ_{k} < μ_{s}$

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