A car of mass m is moving with momentum p.If μ be the coeffecient of friction between the tyres and the road, what will be stopping distance due to friction alone ?
p2 / 2μg
p2 / 2mμg
p2 / 2m2μg
p2 / 2mg
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 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 disc revolves in a horizontal plane at a steady rate of 3 r.p.s.A coin will remain on the disc if it is kept at a distance of 2 cm from the axis of rotation.What is the coeffecient of friction between the coin and the disc? g = 9.8 m/s2
0.724
0.856
0.987
0.685
A block of metal of mass 2 kg is resting on a frictionless floor.It is struck by a jet releasing water at the rate of 1 kg/sec and at a speed of 5 m/s.What will be the initial acceleration of the block ?
3.5 m/s2
4.5 m/s2
2.5 m/s2
none of these
Friction is the result of
gravitational acceleration
molecular interaction
magnetic interaction
nuclear interaction
A smooth block is released at rest on a 450 incline and then slides a distance d. The time taken to slide is n times as much to slide on rough incline than on a smooth incline. The coefficient of friction is
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
A marble block of mass 2 kg lying on ice, when given a velocity of 6 ms-1, is stopped by friction in 10 s. Then the coefficient of friction is
0.02
0.03
0.06
0.01
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.
