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What Is Friction?

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Sudipa Sarkar Profile
Sudipa Sarkar answered
Friction is the force which opposes the relative motion of two surfaces in contact. Friction plays an important role in our lives. It is friction between the ground and the sole of our shoes that make walking possible and it is lack of friction that makes our feet slip on highly polished surfaces.

The force of friction that acts when a body is moving (sliding) on a surface is called sliding friction. The amount of sliding friction depends on the nature of the two surfaces and not on the area of contact. However, it also depends on the weight of the moving body.

When a cylindrical or spherical body rolls over a surface, the force opposing the motion is called rolling friction. For the same pair of materials, rolling friction is much smaller than sliding friction.

While friction is necessary in some cases, it becomes nuisance in others. Friction in machines wastes energy and also causes wear and tear. This friction is reduced by using (1) lubricants, and (2) ball bearings.
Anonymous Profile
Anonymous answered
The word 'friction' is a noun which means the rubbing of one surface against another. In Physics, it refers to the resistance of an object or body to relative motion. It can also be used to refer to a clash of opinion between two people, or two states and the conflict arising from that. For instance, ' the friction between America and Iran over Nuclear enrichment.
Anonymous Profile
Anonymous answered
Friction is a force when two objects rub together and produces heat.
Anonymous Profile
Anonymous answered
It is a force that opposes motion that is why things stop eventually.

Eg. When a car is moving and suddenly brakes, it will stop after sometime.
CJ Dulay Profile
CJ Dulay answered
Friction is when two objects are touching and opposes each other's motion (slows it down)
Anonymous Profile
Anonymous answered
Friction is the force produced when one object moves in a different direction in relation to another object with which it is in contact with.

E.g. When a car moves along the road, friction is produced between the cars tyres and the road surface.
thanked the writer.
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Anonymous commented
I really liked your comments about friction this information can help me to do my reseach.
amber Jhon Profile
amber Jhon answered
Friction is a resisting force which opposes the relative motion of two sliding bodies. This force is due to the rough surface of sliding bodies. There are many advantages of force of friction. Friction helps in walking. We cannot walk without friction on the road. The vehicles can easily move on the roads because of friction. If force of friction is not present between road and tires of vehicles, vehicles may slip. A nail stays in a wall due to force of friction. Moreover, writing and rubbing also need force of friction.

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