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Sliding Friction

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Friction is a common topic introduced and investigated during the early age of classical mechanics. The two important fundamental forces in the nature are electromagnetic and gravitational force.

The Frictional force is arisen due to the electromagnetic attraction of two particles or objects. The fundamental forces can posses some unique properties which can not posses by friction. We can observe the friction in macroscopic bodies because, it is derived from the electromagnetic force. There are different types of friction. The important types are static, kinetic, rolling, sliding friction etc.

The Frictional force which is acting on a sliding body is usually considered as the the function of the velocity of the center of mass of the body. Generally, the Frictional forceĀ  depends on the instantaneous velocity as well as the velocity of the sliding object. Neglecting the wear processes we can say that friction force is arises from the transfer of translational kinetic energy into random heat motion.

What is Sliding Friction?

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One of the important types among the friction is sliding friction. Sliding Friction is a type of friction which can stop the motion of an object which is in sliding movement. It occurs when two surfaces are sliding against each other.
The main factors affecting the sliding friction is weight and the stickiness of the surfaces. But the surface does not affect the sliding friction of a body. It is an effective friction to stop the moving objects.

Sliding Friction

Sliding Friction Definition

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Sliding friction is defined as when two surfaces are sliding across each other, a force is pressing these surfaces. So a drag force is created between these two surfaces and which is parallel to the surfaces. This drag force is known as the sliding friction. This is also termed as kinetic friction.

Sliding Friction Equation

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The equation for sliding friction is given as,
F = $\mu$N
where,
F is the sliding friction
$\mu$ is the sliding friction coefficient
N is the normal force

Coefficient of Sliding Friction

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Coefficient of Sliding Friction is defined as the ratio between the frictional force which is parallel to the contacting surface and the normal force with which the objects press together.

Consider a body resting on a surface and this body starts to move, the sliding friction is different from the static friction. The formula for the coefficient to sliding friction is same as that of the static friction and normally it is less than that of the static coefficient of friction.

$\mu$ = $\frac{F}{N}$
where,
$\mu$
is the coefficient of sliding friction
F is the tangential force which causes the sliding movement
N is the normal force

Static Friction Vs Sliding Friction

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Static friction is defined as the friction produced when the object is at rest. The force of static friction is equal to the force we are applying for a body to move.

Sliding friction is the frictional force between the object and the surface of contact on which the body is sliding. The coefficient of static friction is larger compared to that of the coefficient of sliding friction.

Sliding Friction Force

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Sliding friction is a kind of friction which arises due to the sliding movement of two contacting body. The force which over come the sliding friction is also known as the sliding friction force.

Sliding Friction Examples

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The examples of sliding friction are given blow.
  • Rubbing of hands
  • A book is pushed across the table
  • A card is pushed in to the envelop
The figures related to sliding friction is given below.

Sliding Block
Sliding Friction Examples