Home
Class 12
PHYSICS
Block A of mass 2 kg is placed over blo...

Block A of mass 2 kg is placed over block B of mass 8 kg .The combination is placed over a rough horizonatal surface .Cofficient of friction between B and the floor is 0.5 .Coefficient of friction berween A and B is 0.4 .A horizontal force of 10 N is applied on block B .The force of friction between A and B is
(g=10 m`s^(-2))`

A

100N

B

40N

C

50N

D

zero

Text Solution

Verified by Experts

The correct Answer is:
d
Force of friction between block B and ground is
`F_(f)=muR = 0.5 xx 10 xx 10 = 50 N.`
Since force applied on B is less than frictional force so block B will not move w.r.t. ground. So there is no relative motion between block B and block A. So frictional force between A and B is zero.
:. Correct choice is (d).
Promotional Banner

Topper's Solved these Questions

  • LAWS OF MOTION

    MODERN PUBLICATION|Exercise Revision test|43 Videos

  • LAWS OF MOTION

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTION (LEVEL-III)|2 Videos

  • HEAT AND THERMODYNAMICS

    MODERN PUBLICATION|Exercise Recent Competitve Questions|17 Videos

  • MAGNETOSTATICS

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTION|5 Videos

Similar Questions

Explore conceptually related problems

A block of mass 4 kg is placed on the floor. The coefficient of static friction is 0.4. If a force of 12 N is applied on the block parallel to the floor, the force of friction between the block and floor (g = 10 ms^(-2))

A 10 kg box is placed on a surface. Coefficient of friction between surface and box is u = 0.5. Horizontal force of 100N is applied. Acceleration of block will be :

A body 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 :

block of mass 0-1 kg is held against a wall by applying a horizontal force of 5 N on the block. If the coefficient of friction between the block and the mass is 0.5, the magnitude of the frictional force acting on the block is :

A block 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 0.8 If the frictional force on the block is 10 N the mass of the block is " "(g=10 ms ^(-2))

A block of weight 200 N is pulled along a rough hori zontal surface at constant speed by a force 100 N acting at an angle 30^(@) above the horizontal. The coefficient of kinetic friction between the block and the surface is :

The mass of block A is 100 kg and that of block B is 200 kg. The coefficient of friction between A and B is 0.2 and that between B and ground level is 0.3. The minimum force which will make the block B move, will be:

A marble block of mass 2 kg lying on ice when given a velocity of 6 m//s is stopped by friction in 10 s. Then the coefficient of friction is:

A body of mass 2 kg initially at rest moves under the action of an applied horizontal force of 7N on a table with coefficient of kinetic friction = 0.1 . Compute the Work done by friction in 10s.

A body of mass 2 kg initially at rest moves under the action of an applied horizontal force of 7N on a table with coefficient of kinetic friction = 0.1 . Compute the Work done by the applied force in 10s.