What Is Friction?

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.

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.

Friction is a force when two objects rub together and produces heat.

The force in witch something is pulled

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.

Friction is when two objects are touching and opposes each other's motion (slows it down)

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.