Question

Arrange the frictions in their increasing orders 1.static friction 2.sliding friction 3.rolling friction

Answer 1

Rolling friction - sliding friction - static friction

Answer 2

Friction occur only if there be two bodies and they have contact with each other (physical!).

In order to arrange them in increasing order we can write :

3 < 2 < 1

This is because the less the area be in contact with another body less will be the friction.

Here which rolling friction have very less contact with any other body, while sliding or static friction have large area contact with other body.