Everything about Brake totally explained
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. The
kinetic energy lost by the moving part is usually translated to
heat by
friction. 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.
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. The brakes must therefore dissipate four times as much energy to stop it and consequently the
braking distance is four times as long.
Brakes of some description are fitted to most
wheeled
vehicles, including
automobiles of all kinds,
trucks,
trains,
motorcycles, and
bicycles.
Baggage carts and
shopping carts may have them for use on a
moving ramp.
Some
aeroplanes are fitted with wheel brakes on the
undercarriage. Some aircraft also feature
air brakes designed to slow them down in flight. Notable examples include
gliders and some
WWII-era
fighter aircraft. 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.
Deceleration and avoiding
acceleration when going downhill can also be achieved by using a low
gear; see
engine braking.
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.
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. 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.
Further Information
Get more info on 'Brake'.
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