General Knowledge - Basic General Knowledge - Discussion

Since in sliding the point of contact rely over a surface it experience greater friction where as in rolling the point of contact is a point or atmost an axis, it experience less friction than sliding.
Eg: sliding a spherical stone over a slant surface is more difficult than rolling the stone over that surface.
However, the surface also plays an important role in friction. i.e If the surface is too smooth (eg:ice) the friction is same in both the cases. Since the surface opposes no reluctance on the bodies.

Sliding friction is when objects such as a cube slide on their surface.

Rolling friction is when an object rolls such as a circular barrel, this type of friction includes lesser contact and is much better to sustain.

Dynamic friction is essentially sliding friction when objects rub together.

Static friction is the friction experienced by the object when it is at rest and the friction required to overcome before you move on to a different type of friction explained above.

I hope this helps everybody.

Dynamic friction:- friction offered by the body when it is moving.

Static friction:- friction offered by the body when it is in steady.

When the body is moving as compared to steady state it offers less friction than the steady state.

Therefore D is not the answer.

And in other C option when potential energy is converted into kinetic energy experience certain friction on the surface.

Both C and D both are not correct answer.

Frictional force of the sliding more than the rolling because surface area of sliding body more than the rolling body.

Example: If we throw a bangle on a flour which has slight rough surface.

The bangle moves for some time. If we throw a bolt on the surface of the flour, then the bolt does not move so far comparing to the bangle, because it has flat surfaces.

In sliding we have to apply more force to crush the irregularities interlocking between the two objects for example rubbing two sandpaper against each other.

While in rolling irregularities are not crushed beneath this irregular surface just roll over the other like a gear system and provide less friction and force to move.

Rolling friction is the resistance to motion experienced by a body when it rolls upon another. It is much less than sliding friction for same pair of bodies. When one body rolls upon another, there is theoretically no sliding or slip between them. And if both are perfectly rigid, there is no surface of contact.

If a body is sliding or moving on the other body (surface) means it creates friction with the surface, sliding on the surface means the body cannot revolve on its axis and it means that is rubbing over the surface, rolling means the body is revolving along its horizontal axis in contact with the surface.

Rolling friction is less than sliding becuse in sliding friction point of contact is not changing of moving body, whereas in rolling point of contact is changing while rolling body is in motion moreover you may find value of coeficient of friction (mu) is less for rolling as compared to sliding

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

There are several types of friction: Dry friction resists relative lateral motion of two solid surfaces in contact.

Answer is wrong beacause :.

In sliding- surface is contact with surface and more friction than rolling.

In rolling- one point is contacted with surafce at a time so less friction than sliding.

Hence the answer is wrong.