can value of coefficient of friction ever exceed unity?if yes,when and how?

Question

can value of coefficient of friction ever exceed unity?if yes,when and how?

Answer 1

Rubber in contact with other surfaces can yield friction coefficients from 1.0 to 2.0.



http://en.wikipedia.org/wiki/Friction

Answer 2

YES!

it can exceed unity. good qestion..

i'll give u an example..





suppose a block is sticked to the surface using fevicol..

coefficient of friction increases several times... infact much more than unity!



in most of the practical cases u wont find it exceeding unity.. but coefficient of friction can actually have any value!