rigid and elastic.

The two solid COF can also vary considerably depending on friction or dry friction call is lubricated – a form of fluid friction. This may seem obvious, but there are some materials that COF remains the same regardless of the presence or absence of lubricant, such as steel on steel and polyethylene to Teflon.

The laws of the three laws of dry friction and Amontons “first and second friction

Amontons First Law “:” The friction force is directly proportional to the applied load. “For example, doubling the load of the friction force will also double – increases or decreases proportionately.

Amontons Second Law “:” The friction force is independent of the apparent surface of contact. Flat “areas like the face of a brick or smooth sheet steel, are just shots from the nerve endings in your fingers can detect.

All surfaces to form a row of peaks and valleys seen in the microscope, the peak height, which are determined by the type of material.

According to the law Amontons First, these peaks will be crushed or bent in proportion to the normal force, causing more or less at the peaks of friction contact. But if you extend a certain weight in a wider area, all they do is to reduce weight at any time under the pressure equation P = F / A, P pressure, F for force, and region.

The force is constant as the weight of the object in question does not change, meaning that changes in the surface, the pressure must also change with an inverse proportion. This means that less material will actually be in contact per unit area. This results in a lump sum equal to the force of friction the same weight and power, demonstrating the second law of Amontons. ”

Rubber tires and the second law of Amontons ”

Well, what about rubber tires? Good question. Amontons The second law “is an idealization which is more or less rigid and elastic. Traction apparent upper size tires can be attributed to the fact that the rubber is actually relatively slight elastic deformation to accommodate the geometry of the different soil conditions, and therefore be considered as an exception to this law. The most friction forces often provide elasticity is negligible compared with the amount of COF tape defined by the material. – Because the wider tires to compensate for the wear rate faster with more rubber COF distributing weight over a larger area! Contrary to popular belief, is the main reason for wider tires, not the width, in itself, provides more traction. For most practical purposes, the second law of Amontons “still stands.

Coulomb law of friction “dynamic friction is independent of sliding speed.” It’s simple and simply says that the rate at which two bodies move in relation to another is irrelevant in determining the kinetic friction force.

Posted in science | Tags: coefficient of friction, coefficient of static friction, drag force, dry friction, example of static friction, fluid friction, force of friction, friction coefficient, friction drive, friction force, frictional force, internal friction, rubber flooring, static friction and kinetic friction, types of friction

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entertainment for children.

Recycling

To eliminate recycling and reuse of materials such as glass containers, plastic bags, paper, fabric, etc. at the national level to reduce waste pollution. Use plastic bags has increased dramatically. Paper bags or jute bags can be a good alternative for them. Toys made of clay can be a great source of entertainment for children.

Reforestation

Wastelands, erosion and flooding can be controlled through reforestation. Vast forests have become the victims of the greed of man. Every person on earth should decide to plant trees to save our planet Earth.

Waste treatment

The biological treatment of wastes with anaerobic microorganisms such as methanogens and acetogenic is recommended because it the reduction of waste ground into a form less toxic and biodegradable helps. Industrial and radioactive waste must be properly before the soil can be treated. Large areas of man-made desserts laugh about us. If we should not build tanks and containers made of natural fertile ground not stop the destruction?

Posted in science | Tags: atmospheric nitrogen, causes of soil pollution, chemical fertilizers, glass containers, greed of man, jute bags, main causes of soil pollution, mechanical weathering, pesticides insecticides, soil erosion, soil fertility, soil minerals, use of pesticides, waste pollution, weathering of rocks

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technical

A male or drone bees usually do a bit of bad press, and women often how are you poor creatures deficiencies as a representative of the male sex in general, he said.

Early life for drones

For a drone in the life of his mother ‘The Queen’ has to decide in an unfertilized egg, so this poor orphan of life, or for more technical “haploid” funds are starting to sit. Maybe it’s the pure line, the drone that leads you to believe that he is a prince among his sisters humble worker, who was as a result of a wild party “ pairing her mother, the Queen visited in his youth reckless .

Before the queen can lay eggs of drones, workers have to disturb the way of uniform cell structure created in the comb of the hive, a cell that is slightly larger than that of young women working necessary preparation, like the drone in the recreation cell for 3 days for a young worker, and more.

The drone eggs on day 3 hatch into a larva, like all the worker bee’s eggs. The drone larva passes of 7 days for the larval stage (6 days a worker bee) during this time feeds on pollen and nectar mix of their adult sisters. Drone larvae after 7 days it becomes a pupa. The cell is then limited by the bees wax worker and drone pupa remains there for 14 days (12 days of a worker bee) emerging as a fully trained adult bees honey drones on day 24

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Middle Ages

Most alternative energy: energy systems without the presence of harmful effects of burning conventional fuels, such as high carbon dioxide emissions as an important contributory reason for the change. Alternative energy, also known as renewable energy or renewable energy is an environmentally friendly and intelligent tactics are likely to make the earth substances, such as solar or wind to energy.

Economic historians have analyzed alternative energy sources and analyze these transitions as critical, what to significant economic improvement. In the late Middle Ages, as an example, coal was replaced wood as the main form of electricity than European men of wood, because they are so good deforestation.

Another illustration comes from kerosene, which was created as an alternative to whale oil as soon as the depletion of whale stocks is in the middle of the nineteenth century, whale oil cost asked to escalate. Some time went by, whale is a prominent type of fuel and lubrication for heat lamps. This new form of oil, first in Pennsylvania in 1859 turned on, eventually supplanted whale oil.

Solar and wind energy are two illustrations of additional powers that is to replace conventional fossil fuels can be long when our finite resource of fossil fuels and reduce the prices escalated steadily. Today you will be a lot of companies to study edge extensions and applications to find the sun and wind energy, it’s basically a matter of time before the extensive consumption.

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generations

In fact, I heard people talking about 100 years of ship design and the concept of value, where no man has gone before. First, we need 100 years to build a spaceship, and must be large enough so that people of 100 years in space.

There will be several generations of the event, not followers, distribution and marketing. But that’s okay, because every time the ship arrived from another planet or moon houses, there must be some people out there colony. Fortunately, there are many families that are genetically very different, giving them the opportunity to work with the best genes and stronger team that is expanding. I would say that this theory involves a dandelion.

Why you ask, is actually a dandelion is composed of several small parts, seeds, if you want to multiply so that each one of them in a state for themselves. Starship has 100 years to establish a system of planting material release and future small group of colonies, while maintaining the ever reproduce human incubator. Therefore, although 100 years have passed, ship lost on the road, or a total of 100 years, which have been planted many colonies on the road.

Yes, no, all of which comes from dandelion for another plant that does not mean that each colony grow to survive, this world is harsh and hostile world, but if the settlers have the right resources, relationships and genius will hope to survive and prosper. You build something out of nothing, like our ancestors who came from elsewhere. The fact that my ancestors moved to the Mayflower in America – and what a great country this is.

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stylish design

Gold jewelry is made of objects such as necklaces, bracelets, rings, earrings, bracelets and other jewelry made highly rated amateur. Gold was used for manufacturing jewelry for many centuries. While no other material to overcome the popularity of gold jewelry.

They can earn in the manufacture or sale of gold jewelry higher returns. Invest because of the ongoing commitment of the jewelry lovers in it. What are the causes jewelry to enjoy this great among the regular customers?

Designer and traditional values

Gold jewelry manufacturers of the material as an experiment. Traditional design gold jewelry from around the world have always been angry. Meanwhile, the jewelry designer, is also very popular. Women in adolescence affects fashion styles, contemporary gold jewelry. As a result, gold jewelry to meet all expectations.

Great future investment

Regardless of the age element of gold jewelry, she continues to be an excellent form of investment. If the economic crisis, you can expect from your investments in gold jewelry to pay the appropriate award. This is one of the main reasons why those who invested in gold jewelry.

Impressive retain value

Gold jewelry is less likely to get out of shape over time. This quality of gold jewelry, to maintain the appearance and value is another reason why consumers prefer products from other materials.

Perfect Wedding Jewelry

When it comes to wedding jewelry, gold material strikes the mind. In countries like India, gold jewelry is an integral part of wedding ceremonies in different countries. Furthermore, are marriages in Western countries it is the presence of gold jewelry.

Combination with other materials

Finally, gold jewelry by combining gold with other materials designed very popular with customers. Usually find a stylish design, the use of gold and diamonds, pearls, gemstones and pearls makes. There is a high quality piece of jewelry shoppers with great admiration, these non-traditional jewelry designs.

Gold jewelry seller from the sale of gold in different styles in different parts of the world designed to benefit. The popularity of different types of jewelry comes across geographical boundaries, dividing the number of gold jewelry fans.

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