FrictionHard
Question
A motor cyclist want to drive on the vertical surface of a wooden well of radius 10 m with a minimum speed of 20 m/s. The minimum value of coefficient of friction between the tyres and the wall of the wood must be (g = 10m/s2) :-
Options
A.0.4
B.0.2
C.0.5
D.0.25
Solution
N = 
.........(1)
f ≥ mg .........(2)
μN ≥ mg .........(3)
from (1), (2) & (3)
μ
≥ mg ⇒ μ ≥ 
μ ≥ 0.25
.........(1)f ≥ mg .........(2)
μN ≥ mg .........(3)
from (1), (2) & (3)
μ
≥ mg ⇒ μ ≥ μ ≥ 0.25
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