General Knowledge - Basic General Knowledge - Discussion


Friction can be reduced by changing from

[A]. sliding to rolling
[B]. rolling to sliding
[C]. potential energy to kinetic energy
[D]. dynamic to static

Answer: Option A


No answer description available for this question.

Mohsin said: (Sep 24, 2010)  
Anyone can explain this answer please?

Mahesh said: (Oct 6, 2010)  
Can any one explain what is sliding and rolling?

Divya Pandey said: (Oct 18, 2010)  
Sliding: To move over a surface while maintaining smooth continuous contact.

Rolling: To move forward along a surface by revolving on an axis or by repeatedly turning over.

Santosh Batta said: (Dec 28, 2010)  
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.

Vishal Joshi said: (Mar 22, 2011)  
It is done because of contact area which used in sliding is more then rolling. In rolling motion only point contact have been done.

Spandana said: (Jul 12, 2011)  
Lesser the contact area lesser is the friction.

Sushant said: (Jul 14, 2011)  
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

Roshan said: (Jul 30, 2011)  
Thanks for such understandable explanation with examples.

Parveen said: (Sep 19, 2011)  
There are 4 types of friction
limiting-it is self adjusting friction
lesser the surface of contact lesser the friction
the coefficient of friction is lesser in rolling fricting

Akhil Mishra said: (Oct 10, 2011)  
More the surface of contact more will be friction sliding involves large surface contact than rolling.

Devbrat said: (Dec 5, 2011)  
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.

Akshay said: (Jan 7, 2012)  
Coefficient of rolling friction is always less than that of sliding friction.

Chandru said: (Jan 21, 2012)  
Mass of an object leads to excerting force against the surface while sliding. While rolling an object then the mass gets acceleration and gets momentum with kinetic energy that reduces friction against the surface.

Vamsi said: (Jun 20, 2012)  
To applying the slow moment of force to it, then it is in fast motion.

Anupam Rakshit said: (Aug 11, 2012)  
How rolling can affect friction ?

Ravi said: (Sep 10, 2012)  
In sliding more surface area is used means more friction and more loss to the object means damaged.

But in sliding less surface area or move along only one axis therefore less friction.

Deepak Kumar said: (Sep 22, 2012)  
Slidng: area of contaCt is more (greater friction).
Roling: area of contact becomes much less (lower friction).

Sangey said: (Dec 8, 2012)  
In sliding friction whole part of the body is contact with the surface whereas in rolling friction only one part of object is in contact when the body is in motion.

Mani said: (Jan 23, 2013)  
Sliding consist more friction than rolling. Because it has sliding consist large contact surface than rolling.

Kriti said: (Jun 19, 2013)  
Why its vice versa is not true?

Brish said: (Jun 20, 2013)  
In sliding surface comes into contact while in rolling either point or line contact occurs between surface.

Pankaj Singal said: (Aug 5, 2013)  
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.

Vipin Mittal said: (Aug 9, 2013)  
Frictional force in sliding > frictional force in rolling.

Because surface area of sliding will more than the rolling.

So, friction can be reduced by changing from sliding to solid.

Nagabhushan said: (Aug 20, 2013)  
Why cannot be potential energy to kinetic energy and dynamic to static friction please explain?

Bori said: (Sep 6, 2013)  
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.

Sarva said: (Oct 20, 2013)  
Sliding has an one direction for flow but rolling has many direction to take flow, so opposing force will be reduced.

Avni said: (Jan 1, 2014)  
This is because more of the body comes in contact with the surface than when rolling. Therefore while sliding friction is increased.

Jalepeno Poke said: (May 4, 2014)  
Since rolling friction is smaller than sliding friction, it helps reduce the amount of friction between two surfaces in contact.

Sameer said: (May 11, 2014)  
Sliding has one direction but rolling has many direction to take flow.

Anu said: (Oct 25, 2014)  
Rolling has point contact between the two actual condition of the motion points.

Sathwika said: (Nov 5, 2014)  
Can any one tell me what friction mean?

Ashish Kumar Neeraj said: (Nov 16, 2014)  
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.

Chandra said: (Jan 31, 2015)  
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.

Arun said: (Apr 22, 2015)  
Just take an example of pulling a bucket of water from a well. It requires considerably less effort to draw the water from the well using a pulley which acts as a roller.

Ratnesh said: (May 30, 2015)  
Answer is wrong:

D would be correct. Friction can be brought to zero if we change the object from dynamic to static position. D would be more appropriate than A.

Pragati said: (Jun 24, 2015)  
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.

Adarsh said: (Mar 12, 2016)  
Coefficient of friction for rolling is a far less than that of sliding. And static state doesn't mean no force is applied on body. Friction is there to resist force.

Adarsh said: (Mar 12, 2016)  
Friction doesn't depend on surface area.

Shubhangi said: (May 27, 2016)  
Good information, Thank you all.

Arsh said: (Jun 2, 2016)  
How can we reduce friction from sliding to rolling?

But on rolling a frictional force will be acting on the body thereby, resisting its motion. Whereas sliding can take place if there is a less frictional floor.

Sri Divya Tandra said: (Aug 10, 2016)  
It is Based on contact with the area.

Saipraneeth said: (Feb 26, 2017)  
It's simple that which converts sliding friction into rolling friction. Eg: (hard steel balls) placed between moving parts which converts sliding into rolling.

Rahul Patel said: (Mar 24, 2017)  
Describe Sliding in detail.

Krishna S G said: (May 9, 2017)  
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.

Rjking said: (Jun 20, 2017)  
Friction between the two types of contact rolling & slides but they moving on what type of area that's details may be help like water hill.

Vjsjs said: (Oct 31, 2017)  
Its wrong because it an object is static it has 0 friction so answer is D.

Gowtham said: (Jun 5, 2018)  
The friction is increased on the sliding object at the time the sliding force is converted to rolling process.

Philani Gcabashe said: (Nov 23, 2018)  
Well said @Santosh. It is all about the point of contact versus the axis of rotation.

Swar said: (Jan 13, 2019)  
Yes, right @Spandana.

Deepika said: (Apr 14, 2019)  
What is dynamic and static?

Shunmugaarthi said: (Jun 15, 2019)  
Any object rolls when there is no friction. So, Sliding to Rolling is correct.

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