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
Create a free account to view solution
View Solution FreeMore Friction Questions
A plank is held at an angle a to the horizontal (Fig.) on two fixed supports A and B. The plank can slide against the su...A uniform solid sphere rolls on a horizontal surface at 20 ms-1. It then rolls up and incline having an angle of inclina...A wooden block of mass m resting on a rough horizontal table (coefficient of friction = μ) is pulled by a force F a...The upper portion of an inclined plane of inclination a is smooth and the lower portion is rough. A particle slides down...The upper half of an inclinded plane of inclination θ is perfectly smooth while lower half is rough. A block starti...