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The low resistance to motion compared to dragging is explained as follows refer to friction:. Bearings are used to help reduce friction at the interface.
In the simplest and oldest case the bearing is just a round hole through which the axle passes a " plain bearing ".
Additional energy is lost from the wheel-to-road interface. This is termed rolling resistance which is predominantly a deformation loss.
This energy is also lowered by the use of a wheel in comparison to dragging because the net force on the contact point between the road and the wheel is almost perpendicular to the ground, and hence, generates an almost zero net work.
This depends on the nature of the ground, of the material of the wheel, its inflation in the case of a tire, the net torque exerted by the eventual engine, and many other factors.
A wheel can also offer advantages in traversing irregular surfaces if the wheel radius is sufficiently large compared to the irregularities.
The wheel alone is not a machine, but when attached to an axle in conjunction with bearing, it forms the wheel and axle , one of the simple machines.
A driven wheel is an example of a wheel and axle. Wheels pre-date driven wheels by about years, themselves an evolution of using round logs as rollers to move a heavy load—a practice going back in pre-history so far that it has not been dated.
The rim is the "outer edge of a wheel, holding the tire. For example, on a bicycle wheel the rim is a large hoop attached to the outer ends of the spokes of the wheel that holds the tire and tube.
In the 1st millennium BCE an iron rim was introduced around the wooden wheels of chariots. The hub is the center of the wheel, and typically houses a bearing , and is where the spokes meet.
A hubless wheel also known as a rim-rider or centerless wheel is a type of wheel with no center hub. More specifically, the hub is actually almost as big as the wheel itself.
The axle is hollow, following the wheel at very close tolerances. A spoke is one of some number of rods radiating from the center of a wheel the hub where the axle connects , connecting the hub with the round traction surface.
The term originally referred to portions of a log which had been split lengthwise into four or six sections. The radial members of a wagon wheel were made by carving a spoke from a log into their finished shape.
A spokeshave is a tool originally developed for this purpose. Eventually, the term spoke was more commonly applied to the finished product of the wheelwright 's work, than to the materials used.
The rims of wire wheels or "wire spoked wheels" are connected to their hubs by wire spokes. Although these wires are generally stiffer than a typical wire rope , they function mechanically the same as tensioned flexible wires, keeping the rim true while supporting applied loads.
Wire wheels are used on most bicycles and still used on many motorcycles. They were invented by aeronautical engineer George Cayley and first used in bicycles by James Starley.
A process of assembling wire wheels is described as wheelbuilding. A tire in American English and Canadian English or tyre in some Commonwealth Nations such as UK, India, South Africa and Australia is a ring-shaped covering that fits around a wheel rim to protect it and enable better vehicle performance by providing a flexible cushion that absorbs shock while keeping the wheel in close contact with the ground.
The word itself may be derived from the word "tie," which refers to the outer steel ring part of a wooden cart wheel that ties the wood segments together see Etymology below.
The fundamental materials of modern tires are synthetic rubber , natural rubber , fabric and wire, along with other compound chemicals.
They consist of a tread and a body. The tread provides traction while the body ensures support.
Before rubber was invented, the first versions of tires were simply bands of metal that fitted around wooden wheels to prevent wear and tear.
Today, the vast majority of tires are pneumatic inflatable structures , comprising a doughnut-shaped body of cords and wires encased in rubber and generally filled with compressed air to form an inflatable cushion.
Pneumatic tires are used on many types of vehicles, such as cars , bicycles , motorcycles , trucks , earthmovers , and aircraft. A trywheel is an arrangement of three wheels mounted on a y-shaped frame for the purpose of passing over stairs or rough ground.
These may be driven by external force or integral motors. While wheels are very widely used for ground transport, there are alternatives, some of which are suitable for terrain where wheels are ineffective.
Alternative methods for ground transport without wheels include:. A recent invention is the so-called Liddiard Wheel, which claims to be a superior omnidirectional wheel.
The wheel has also become a strong cultural and spiritual metaphor for a cycle or regular repetition see chakra , reincarnation , Yin and Yang among others.
As such and because of the difficult terrain, wheeled vehicles were forbidden in old Tibet. The wheel in ancient China is seen as a symbol of health and strength and utilized by some villages as a tool to predict future health and success.
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Zur mobilen Version wechseln. He breaks a fly on the wheel. Custom wheels are effective at captivating audiences in presentations, conferences, and trade shows.
Simply add a wheel to introduce interaction that PowerPoints lack. Rather than hassling with expensive equipment, ticket systems, or writing names on slips of paper for donor raffles, project a wheel for all to see at your event.
Spice it up even more with customizations like adding your logo. Wheels are great visual elements to use in videos. Wheel Decide is popular on Twitch and YouTube.
Encourage more activity on your website with a wheel that reveals extra content, randomly navigates you to other pages, or brings life to a simple list.
Education Pick a random student in class to answer a question or participate in a classroom activity. Spin a wheel of questions, topics, or vocabulary terms.
This is a great substitute for studying with flash cards, and since the topics shuffle, everyone stays on their toes. Use the wheel to randomly assign groups or teams.