Question

expression for friction and coefficient of friction in rolling motion ​

Answer 1

The coefficient of rolling friction is the indication of how great the rolling resistance is for a given normal force between the wheel and the surface upon which it is rolling...

Any ball or wheel has rolling friction when rolled on a surface. Some examples of items that have rolling friction are: ... Soccer ball, basketball, or baseball. Car tires...

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Answer 2

Answer:

F<mg sino/1+r2/k2

U<tano/1+r2/"k2