A wheel is a rotating component that is intended to turn on an axle bearing. The wheel is one of the key components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be moved easily facilitating movement or transportation while supporting a load, or performing labor in machines. Wheels are also used for other purposes, such as a ship's wheel, steering wheel, potter's wheel, and flywheel.
A disc brake is a type of brake that uses the calipers to squeeze pairs of pads against a disc or a rotor to create friction. There are two basic types of brake pad friction mechanisms: abrasive friction and adherent friction. This action slows the rotation of a shaft, such as a vehicle axle, either to reduce its rotational speed or to hold it stationary. The energy of motion is converted into heat, which must be dispersed.
A brake is a mechanical device that inhibits motion by absorbing energy from a moving system. It is used for slowing or stopping a moving vehicle, wheel, axle, or to prevent its motion, most often accomplished by means of friction.
Inline speed skating is the roller sport of racing on inline skates. The sport may also be called inline racing or speed skating by participants. Although it primarily evolved from racing on traditional roller skates, the sport is similar enough to ice speed skating that many competitors are known to switch between inline and ice speed skating according to the season.
The Soap Box Derby is a youth-oriented soap box car racing program which has been running in the United States since 1934. Proclaimed "the greatest amateur racing event in the world", the program culminates each July at the FirstEnergy All-American Soap Box Derby World Championship held at Derby Downs in Akron, Ohio, with winners from their local communities travelling from across the US, Canada, Germany and Japan to compete. 2024 will mark the 86th running of the All-American since its inception in 1934 in Dayton, Ohio, having missed four years (1942–1945) during World War II and one (2020) during the COVID pandemic. Cars competing in the program race downhill, propelled by gravity alone.
Hot Wheels is an American brand of scale model cars invented by Elliot Handler and introduced by his company Mattel on May 18, 1968. It was the primary competitor of Matchbox until Mattel bought Matchbox owner Tyco Toys in 1997.
Cub Scouting is part of the Scouting program of the Boy Scouts of America (BSA), available to boys and girls from kindergarten through fifth grade, or 5 to 10 years of age and their families. Its membership is the largest of the five main BSA divisions. Cub Scouting is part of the worldwide Scouting movement and aims to promote character development, citizenship training, personal fitness, and leadership.
A limited-slip differential (LSD) is a type of differential gear train that allows its two output shafts to rotate at different speeds but limits the maximum difference between the two shafts. Limited-slip differentials are often known by the generic trademark Positraction, a brand name owned by General Motors and originally used for its Chevrolet branded vehicles.
A caster is an undriven wheel that is designed to be attached to the bottom of a larger object to enable that object to be moved.
Rolling is a type of motion that combines rotation and translation of that object with respect to a surface, such that, if ideal conditions exist, the two are in contact with each other without sliding.
Rolling resistance, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation of the wheel, roadbed, etc., is recovered when the pressure is removed. Two forms of this are hysteresis losses, and permanent (plastic) deformation of the object or the surface. Note that the slippage between the wheel and the surface also results in energy dissipation. Although some researchers have included this term in rolling resistance, some suggest that this dissipation term should be treated separately from rolling resistance because it is due to the applied torque to the wheel and the resultant slip between the wheel and ground, which is called slip loss or slip resistance. In addition, only the so-called slip resistance involves friction, therefore the name "rolling friction" is to an extent a misnomer.
Brake fade is the reduction in stopping power that can occur after repeated or sustained application of the brakes of a vehicle, especially in high load or high speed conditions. Brake fade can be a factor in any vehicle that utilizes a friction braking system including automobiles, trucks, motorcycles, airplanes, and bicycles.
A mousetrap car is a small vehicle whose only source of motive power is a mousetrap. Variations include the use of multiple traps, or very big rat traps, for added power.
A gravity racer or soapbox is a motorless vehicle which is raced on a downhill road either against the clock or against another competitor. The vehicles are propelled by gravity.
Down and Derby is a 2005 American comedy film written and directed by Eric Hendershot and starring Greg Germann, Lauren Holly, Adam Hicks, and Pat Morita. The movie was filmed outside St. George, Utah.
The raingutter regatta is a racing event for Cub Scouts in the Boy Scouts of America that is the sailboat equivalent of the pinewood derby. The sailboat kit consists of a seven-inch (178 mm) long balsa wood hull, a 6+1⁄2-inch mast, plastic sail, plastic rudder, and metal keel. Within the basic design rules, Scouts are free to paint and decorate their sailboats as they choose. Modifications for speed include the placement of the keel and rudder and the size, shape and location of the sail. A catamaran is an exceptionally fast design, although this modification is not allowed in all races.
Founded in 1915, the Greater Los Angeles Area Council (GLAAC) (#033) served most of the City of Los Angeles as well as several other cities in the greater Los Angeles area. It was one of five Boy Scouts of America councils in Los Angeles County, California. Since its founding in 1915, the Los Angeles Area Council has brought its purpose and values to millions of youth. The Council served 54,567 youth in the Greater Los Angeles Area in 2008 alone.
The space derby was a racing event for Cub Scouts in the Boy Scouts of America that is similar to the pinewood derby car race. Cub Scouts race miniature balsa wood gliders that are propelled by a rubber band and propeller. During the 1960s, this was also known as the "rocket derby".
A train wheel or rail wheel is a type of wheel specially designed for use on railway tracks. The wheel acts as a rolling component, typically press fitted onto an axle and mounted directly on a railway carriage or locomotive, or indirectly on a bogie, also called a truck. The powered wheels under the locomotive are called driving wheels. Wheels are initially cast or forged and then heat-treated to have a specific hardness. New wheels are machined using a lathe to a standardized shape, called a profile, before being installed onto an axle. All wheel profiles are regularly checked to ensure proper interaction between the wheel and the rail. Incorrectly profiled wheels and worn wheels can increase rolling resistance, reduce energy efficiency and may even cause a derailment. The International Union of Railways has defined a standard wheel diameter of 920 mm (36 in), although smaller sizes are used in some rapid transit railway systems and on ro-ro carriages.
Wood car racing is a racing event for youth who build small cars from wood, usually from kits containing a block of pine, plastic wheels and metal axles. Kids from all over the world participate in events related to wood car racing.
