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Braking distance refers to the distance a vehicle will travel from the point when its brakes are fully applied to when it comes to a complete stop. It is primarily affected by the original speed of the vehicle and the coefficient of friction between the tires and the road surface, [Note 1] and negligibly by the tires' rolling resistance and vehicle's air drag.
d MT = braking distance, m (ft) V = design speed, km/h (mph) a = deceleration rate, m/s 2 (ft/s 2) Actual braking distances are affected by the vehicle type and condition, the incline of the road, the available traction, and numerous other factors. A deceleration rate of 3.4 m/s 2 (11.2 ft/s 2) is used to determine stopping sight distance. [6]
Braking distance: feet feet meters safety: shorter is better Brake specific fuel consumption: lb/(hp·h) lb/(hp·h) g/(kW·h) economics, range lower is better traveled Distance: miles miles kilometers economy higher rating is better for vehicle longevity; lower elapsed is better for vehicle resale Drag coefficient (ratio) (ratio) (ratio)
For context, normal braking usually falls between 3 to 5 mph per second, while slamming on your brakes during an emergency can reach 10 to 12 mph per second. Does my credit score affect telematics ...
In some cases, the brake balance may be adjusted to match the traction (grip) of the vehicle during braking, which usually means distributing a greater braking force to the front (for example 55/45). In other cases, it may be desirable for the brake balance to be the more similar at the front and rear (e.g. 50/50) for the tires to last longer ...
Since kinetic energy increases quadratically with velocity (= /), an object moving at 10 m/s has 100 times as much energy as one of the same mass moving at 1 m/s, and consequently the theoretical braking distance, when braking at the traction limit, is up to 100 times as long. In practice, fast vehicles usually have significant air drag, and ...
Braking system Train speed Distance Stopping time (s) mph km/h yd m Continuous (vacuum) 45 72: 410 370 26 Continuous (vacuum) 45 72: 451 412 30 3 brake vans: 40.9 65.8: 800 730 59 2 brake vans: 40.9 65.8: 631 577 44 2 brake vans: 45 72: 795 727 55 1 brake van: 45 72: 1,125 1,029 70
British Railway Class 90 infobox showing brake force Brake force to weight ratio of the Class 67 is higher than some other locomotives. In the case of railways, it is important that staff are aware of the brake force of a train so sufficient brake power will be available to bring the train to a halt within the required distance from a given speed.