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 solid hemisphere of weight P rests with its curved surface in contact with a rough inclined plane. A weight Q is place...A block (B) is attached to two unstretched springs S1 and S2 with spring constants k and 4k, respectively (see figure I)...In the shown arrangement if f1, f2 and T be the frictional forces on 2 kg block, 3kg block & tension in the string respe...The upper half of an inclinded plane of inclination θ is perfectly smooth while lower half is rough. A block starti...A block A (5 kg) rests over another block B (3 kg) placed over a smooth horizontal surface. There is friction between A ...