Question

which one of the following surfaces in contact has minimum coefficient of friction​

Answer 1

Answer:

The correct option is A wood on wood has minimum coefficient of friction .

Explanation:

The coefficient of friction value will aid in estimating the surface roughness. The force of friction is proportional to or depends on the normal force operating on any item under observation.

On the same surface, the coefficient of static friction is usually bigger than the coefficient of kinetic friction.

wood on wood has minimum coefficient of friction .

Your question is incomplete, but most probably your full question was...

"Which one of the following surfaces in contact has minimum coefficient of friction  "

a) wood on wood

b) steel on steel  

c) rubber tyres on concrete road  

d) wood on steel