A brake is a device for slowing or stopping the motion of a machine or vehicle, or alternatively a device to restrain it from starting to move again. A machine is any device that uses Energy to perform some activity Vehicles, derived from the Latin word vehiculum, are non-living Means of transport. The kinetic energy lost by the moving part is usually translated to heat by friction. The kinetic energy of an object is the extra Energy which it possesses due to its motion In Physics, heat, symbolized by Q, is Energy transferred from one body or system to another due to a difference in Temperature Friction is the Force resisting the relative motion of two Surfaces in contact or a surface in contact with a fluid (e Alternatively, in regenerative braking, much of the energy is recovered and stored in a flywheel, capacitor or turned into alternating current by an alternator, then rectified and stored in a battery for later use. A regenerative brake is a mechanism that reduces Vehicle speed by converting some of its Kinetic energy into another useful form of energy A flywheel is a mechanical device with significant Moment of inertia used as a storage device for Rotational energy. A capacitor is a passive electrical component that can store Energy in the Electric field between a pair of conductors An alternating current ( AC) is an Electric current whose direction reverses cyclically as opposed to Direct current, whose direction remains constant alternator is an electromechanical device that converts mechanical energy to Alternating current electrical energy A rectifier is an electrical device that converts Alternating current (AC to Direct current (DC a process known as rectification. In electronics a battery is a combination of two or more Electrochemical cells which store chemical Energy which can be converted into electrical energy
Note that kinetic energy increases with the square of the velocity (E = 1/2·m·v2 relationship). This means that if the speed of a vehicle doubles, it has four times as much energy. Speed is the rate of motion, or equivalently the rate of change in position often expressed as Distance d traveled per unit of The brakes must therefore dissipate four times as much energy to stop it and consequently the braking distance is four times as long. Braking distance refers to the distance a vehicle will travel from the point where its Brakes are fully applied to when it comes to a complete stop
Brakes of some description are fitted to most wheeled vehicles, including automobiles of all kinds, trucks, trains, motorcycles, and bicycles. A wheel is a circular device that is capable of rotating on its axis facilitating movement or transportation whilst supporting a load ( Mass) or performing labour in machines Vehicles, derived from the Latin word vehiculum, are non-living Means of transport. This article is about the semi-truck For the North American use of the word see Pickup truck. A train is a connected series of vehicles that move along a track ( Permanent way) to transport freight or passengers from one place to another MotorCycle is the title of a 1993 album by Rock band Daniel Amos, released on BAI Records. The bicycle, cycle, or bike is a pedal-driven, human-powered vehicle with two wheels attached to a frame, one behind Baggage carts and shopping carts may have them for use on a moving ramp. Baggage carts, Luggage carts or Trolleys are small Vehicles Pushed by travelers ( human-powered) to carry individual Luggage A shopping cart (also called a trolley in British, Australian English, and New Zealand English; sometimes referred to as a carriage A moving walkway, moving sidewalk (in the US moving pavement (elsewhere walkalator, travelator, autowalk, horizontal escalator
Some aeroplanes are fitted with wheel brakes on the undercarriage. Overview Fixed-wing aircraft range from small training and recreational aircraft to Wide-body aircraft and military cargo aircraft. In Aviation, the undercarriage or landing gear is the structure (usually wheels that supports an Aircraft on the ground and allows it to taxi Some aircraft also feature air brakes designed to slow them down in flight. In Aeronautics, air brakes are a type of flight control used on Aircraft to reduce speed during landing Notable examples include gliders and some WWII-era fighter aircraft. Terminology A "glider" is an unpowered Aircraft. The most common types of glider are today used for sporting purposes World War II, or the Second World War, (often abbreviated WWII) was a global military conflict which involved a majority of the world's nations, including A fighter aircraft is a Military aircraft designed primarily for air-to-air combat with other Aircraft, as opposed to a Bomber, which is designed These allow the aircraft to maintain a safe speed in a steep descent. The Saab B 17 dive bomber used the deployed undercarriage as an air brake. The Saab 17 was a Swedish bomber-reconnaissance Aircraft. Development and service The project first started at the end of the 1930s as A dive bomber is a Bomber aircraft that Dives directly at its targets in order to provide greater accuracy and limit the exposure to and effectiveness of
Deceleration and avoiding acceleration when going downhill can also be achieved by using a low gear; see engine braking. This is the page for mechanical Gears For other uses see Gear (disambiguation For the gear-like device used to drive a roller chain see Sprocket Engine braking is the act of using the energy-requiring compression stroke of the Internal combustion engine to dissipate energy and slow down a vehicle
Friction brakes on cars store the heat in the rotating part (drum brake or disc brake) during the brake application and release it to the air gradually. A vehicle brake is used to slow down a vehicle by converting its Kinetic energy into heat A drum brake is a Brake in which the Friction is caused by a set of shoes or pads that press against the inner surface of a rotating The disc brake or disk brake is a device for slowing or stopping the rotation of a Wheel.
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Effects on noise pollution
The action of braking for motor vehicles produces recognizable sound level emissions, varying with the specific tire types and with the roadway surface type produces considerable effect upon sound levels or noise pollution emanating from moving vehicles. For the extreme metal band see Hearse (band A hearse is a Funeral Vehicle, a conveyance for the Coffin Roadway noise is the collective sound energy emanating from Motor vehicles In the USA it contributes more to environmental noise exposure than any other noise source and is Noise pollution (or environmental noise) is displeasing human- or machine-created sound that disrupts the activity or balance of human or animal life [1] There is a considerable range in acoustical intensities produced depending upon the specific tire tread design and the rapidity of deceleration required to slow the vehicle.
See also
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References
External links
- How Stuff Works - Brakes
- High Quality Brake System Repairs Guide
- Brakes News Blog
- How to know when to replace your brakes
- Resource on Stanfords solar car brakes
Dictionary
brake
-noun
- A device used to slow or stop a vehicle, by friction; often installed on the wheels.
- something that slows or stops an action
- (nautical) the handle, manned by up to six men, by which a ship's pump was worked
- A thicket, or an area overgrown with briers etc.
- A type of machine for bending sheet metal. (See wikipedia.)
-verb
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