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Friction force

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To understand the notion of friction force , it is convenient to analyze each of the terms that make up the expression.

In the field of physical , is called force (word from Latin fortia) to the cause that can alter the shape or state of motion or rest of a body. The concept is also used to refer to the ability to exert resistance or tolerate a weight.

Touch On the other hand, it is the act and consequence of rubbing or rubbing: removing a superficial piece of something, lightly or gently touching a thing.

All these ideas can you help us understand what are the friction forces . This is what they are called those forces that are generated between the bodies that are in contact . These forces produce a resistance to the movements of one object with respect to the other.

The surface of a body it is never completely smooth: in all cases, it presents certain rough edges . Therefore, if one body is in contact with another, the roughness of both fit, generating resistance to eventual movement.

This means that, if we want to drag an object that is on the ground, we will have to make an effort to achieve that object leave your resting state, since there will be a static friction force that will oppose displacement.

The effective force which will allow to move the objective In short, it will be equal to the sum of the applied force and the friction force (equivalent to that necessary to overcome the resistance that, in the opposite direction, exerts the force of static friction).

In addition to all of the above, we cannot ignore the existence of another series of data of interest on the force of friction. Among those we can highlight the fact that throughout history that has been very important for society to advance in certain areas. Thus, for example, it should be stressed that it was precisely the force of friction between woods that led man to discover how to make fire.

In the same way, it is interesting to know that Leonardo da Vinci was the pioneer in speaking and studying the force of friction. However, we should wait until the seventeenth century for the French physicist Guillaume Amontons to resume his ideas and develop an exhaustive work that resulted in the laws of the aforementioned force. Specifically, these laws came to establish three maxims that are still key today:
-That force does not depend on what is the apparent area of ​​contact.
-The force of friction comes to oppose what is the displacement of a block on a plane.
-The force of the friction comes to be proportional to what is the normal force that the block makes on the aforementioned plane.

Laws those to which later would be added another that was established by another Gallic scientist named Coulomb. Specifically, we are referring to the fact that when the movement of the block on the plane has already begun, the friction force is totally independent of speed.

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