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Highway Engineering - Engineering

Q1:

In a braking test, a vehicle travelling at 36 km ph was stopped at a braking distance of 8.0 m. The average value of the vehicle's skid resistance (friction coefficient) is

A 0.64

B 6.25

C 0.16

D none of these

ANS:C - 0.16

Option c is correct.

Given:- SSD :- 8 M,
V=36kmph then convert.

V= 36 * 5/18= 10 t=2.5 sec by IRC.
SSD = (V*T)+(V^2/2gf),
8 = (10*2.5)+(10^2/2*9.18*f),
8 = 25+100/18.36fm
8 = 30.44f,
f = 8/30.44,
f = 0.26.

It is the nearest value options C.
So, options C is correct.