Question

Rolling friction is ________ sliding friction, if all other factors are the same.

Answer 1

Hint: As we know, if a body can be set into motion on a surface by different ways. The body may be pushed or pulled by a force such that only a particular surface is in contact with the mating surface on which it moves. Or we say if the friction that opposes the motion is called sliding friction. Similarly if any object rolls by placing it on a circular wheel, it will be rolling friction.

Complete Step-by-Step solution:
A Rolling friction is a force that opposes the rolling motion of an object. Or we simply say rolling friction is observed when a round object rolls around a surface.
By knowing the basic understanding of rolling friction, we easily conclude that the study of rolling friction is limited to wheels or rollers and the surface on which they move. That is, for the same weight, the situation is the same whether you put material A or material B on similar carriage and wheels.
Rolling friction for an automobile is the friction generated by the wheel bearings and the tires. If you put the car in Park and drag it, the friction generated by the sliding tires is not rolling friction.
Mathematically we say,
If Frictional force acting on the body f, then
f=${\mu}{mg}$
and We know that,
$ \Rightarrow {{{\mu }}_{\text{r}}}{\text{ < }}{{{\mu }}_{\text{s}}}$
​Where ${{{\mu }}_r}$ and ${{{\mu }}_{\text{s}}}$ are the coefficient of rolling friction and static friction, respectively.
​So, by applying this, we get
$ \Rightarrow $\[{{\text{f}}_{\text{r}}}{\text{ < }}{{\text{f}}_{\text{s}}}\]
So, we conclude that the sliding friction is greater than rolling friction.

Note- Remember that the Sliding friction takes place when two surfaces are rubbed against each other. For example, when a block is slid on a rough surface. Rolling friction takes place when an object rolls on the surface like when a wheel rotates on a road.