Question

Choose the correct statements. The coefficient of static friction depends on

• A. the material of the bodies in contact
• B. quality of machining of the surfaces in contact
• C. presence of foreign matter between the surfaces
• D. area of the surfaces in contact

Answer 1

Answer: (A), (B), (C)

the material of the bodies in contact
presence of foreign matter between the surfaces
quality of machining of the surfaces in contact

It depends on the surface of the material. you see friction is caused due to interlocking between the surfaces of 2 materials...\since the surface differs for different materials...friction depends on the material of body and foreign particles present and quality of surface.

it doesn't depend on the area of surface.

option A,B,C are correct.