Friction is the result of
gravitational acceleration
molecular interaction
magnetic interaction
nuclear interaction
A car turns a corner on a slippery road at a constant speed of 12 m/s. If the coefficient of friction is 0.4, the minimum radius of the arc in metre in which the car turns is
72
36
18
9
When a bicycle is in motion, the force of friction exerted by ground on the two wheels is such that, it acts
In the backward direction on the front wheel and in the forward direction on the rear wheel.
In the forward direction on the front wheel and in the backward direction on the rear wheel.
In the backward direction on both the front and the rear wheels.
In the forward direction on both the front and the rear wheels.
Which of the following is the dimension of coefficient of friction?
[MLT-2]
[M0L0T0]
[M2LT-2]
[M2LT]
Consider a car moving along a straight horizontal road with a speed of 72 km/hr.If the coeffecient of static friction between the tyres and the road is 0.5,the shortest distance in which the car can be stopped is
(Take g = 10 m/s2)
30 m
40 m
72 m
20 m
A heavy uniform chain lies on horizontal table top.If the coeffecient of friction between the chain and the table surface is 0.25,then the maximum friction of the length of the chain that can hang over one edge of the table is
20 %
25 %
35 %
15 %
A block is lying static on the floor.The maximum value of static frictional force on the block is 10 N.If a horizontal force of 8 N is applied to the block,what will be the frictional force on the block ?
2 N
18N
8N
10N
A block of mass 2 kg rests on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is 0.7. The frictional force on the block is
9.8 N
0.7 x 9.8 x √3 N
9.8 x √3 N
0.7 x 9.8 N
A weight W rests on a rough horizontal plane. If the angle of friction be θ, the least force that will move the body along the plane will be
W cosθ
W tanθ
W cotθ
W sinθ
A block is kept on a frictionless inclined surface with angle of inclination α. The incline is given an acceleration a to keep the block stationary. Then a is equal to
g / tanα
g cosecα
g
g tanα
