General Knowledge - Basic General Knowledge - Discussion

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.

It's simple that which converts sliding friction into rolling friction. Eg: (hard steel balls) placed between moving parts which converts sliding into rolling.

Sliding has one direction but rolling has many direction to take flow.

Rolling has point contact between the two actual condition of the motion points.

Can any one tell me what friction mean?

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.

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.

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.

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.

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.