A block of 10 kg is pulled at a constant speed on a rough horizontal surface by a force of 20 N.Find the co- effecient of kinetic friction .Given that g = 10 m/s2 .
0.2
0.5
0.85
0.7
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
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 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 of mass 10 kg is placed on a rough horizontal surface whose coeffecient of friction is 0.5.If a horizontal force of 100 N is applied on it,then acceleration of block will be :
10 m/s2
5 m/s2
15 m/s2
0.5 m/s2
A drum of radius R and mass M ,rolls down without slipping along an inclined plane of angle θ.The frictional force
converts translational energy to rotational energy
dissipates energy as heat
decreases the rotational motion
decreases the rotational and translational motion
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 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
Two iron blocks of equal mass but with double surface area slide down an inclined plane with friction coefficient μ.If the first block with surface area A experience a frictional force f, then the second block with surface area 2A will experience a frictional force
f/2
f
2f
4f
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.
