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Friction

Subject: Physics
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Friction can be described as the resistance between the two surfaces abut each other. The friction can be so great that the surfaces do not move together. Depending on circumstances, it may be desirable high or low friction. It is possible to increase the friction by example surface areas or processing them mechanically so that they become coarser. One can also reduce friction by coating or mechanical processing (eg polishing). The material is also important, different materials provide different friction when they move towards each other. It is also possible to use lubricant and component geometry to reduce friction. Friction is when speed is reduced eg on a dirt road increases friction. Because friction is when the speed reduced to reduce friction on a flat, straight road.

When a wheel rolls, the friction force between the wheel and land a direction such that it prevents the wheel from sliding over the ground. When a car begins to slip when accelerating moves the surface of the wheels backwards compared to the ground. The friction force, which is trying to prevent this movement, is thus directed forward. In a car starts to slide under braking, however, moves the wheels face forward over the ground and the friction force is directed backward. In the same way the friction between the feet and the ground when walking. It is not the friction that provides a retarding force from the ground on a moving car without something called rolling resistance.

When you shoot a box in front of him across the floor, it feels sluggish. Between the box and the floor is a braking force is called the frictional force. The greater the friction force is, the slower it goes. Although, in this case, both the box and the floor's surface looks smooth out there are always bumps. The heavier the object, pushing forward, the harder grasps the unevenness into each other. What material object is also impact on the friction. The friction force between the two steel surfaces is smaller than between two rubber surfaces to give an example.

There are two different types of friction, rolling friction and sliding friction. The box slides over the floor is an example of sliding friction. If you instead put logs in that drawer may scroll on, we are talking about rolling friction. It is easier to move objects when it is rolling friction, the friction is less than glidfriktionen.Friktion is a collective term for dissipative forces opposing the motion. In mechanics distinguishes between vilofriktion and kinetic friction. If a stone lying on a floor is static friction the force that must be overcome in order that the stone will come in motion. When the rock has begun to move seems static friction of the stone will slow down and stop. To hold the stone in constant movement speed must stone influenced by a pulling force is as great as the operating friction. If the tension is greater, the stone's speed increase. If the tension is less than the operating friction stone will cease to move. The larger surface area touching each other and the greater the force that is pushing the surfaces together (such as the top item's weight) the larger the idle and operating friction. A ball bearing minimizes the surface and thus reduces bearing friction. Friction, physics, is a force that opposes the relative motion between two surfaces in contact. Friction resulting from unevenness and adhesion between the surfaces. For solids include adhesives one extreme with an enormous friction force, whereas oil is the other extreme case where almost no friction exists. The subject is studied in tribology. Friction is not a fundamental force, as it arises from electromagnetic forces between atoms. When contacting surfaces move relative to each other, friction converts kinetic energy into heat. Friction between solid objects is often called "dry friction", while the friction forces between the liquid or gas is called "viscous friction". In addition, the term "Internal friction," which describes a body's ability to recover its shape after deformation of the external load. Sliding resistance between two surfaces depends less on the surface texture / roughness and more on the chemical bonds between the surfaces. [1] The friction has a significant impact on road safety. This applies in particular conditions with Split friction. When you shoot a box in front of him across the floor, it feels sluggish. Between the box and the floor is a braking force is called the frictional force. The greater the friction force is, the slower it goes. Although, in this case, both the box and the floor's surface looks smooth out there are always bumps. The heavier the object, pushing forward, the harder grasps the unevenness into each other. What material object is also impact on the friction. The friction force between the two steel surfaces is smaller than between two rubber surfaces to give an example. There are two different types of friction, rolling friction and sliding friction. The box slides over the floor is an example of sliding friction. If you instead put logs in that drawer may scroll on, we are talking about rolling friction. It is easier to move objects when it is rolling friction, the friction is less than sliding friction. The amount of energy required to overcome any frictional forces and holding a combustion engine with associated auxiliaries started at a certain load and rotation speed of the motor called mechanical power loss. It's actually the difference between the amount of the cylinders combusted fuel energy, a so-called power input, and output part.

David Samuelsson

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The following are school projects dealing with friction or in any way related with friction.