Home
Class 11
PHYSICS
Block B is placed on a smooth surface. B...

Block `B` is placed on a smooth surface. Block `A` is placed on rough surface of bolck `B` with coefficient of friction `0.60`. The mass of `A` and `B` are `2 kg` and `4 kg` respectively. Find the frictional force between `A` and `B` ( in `N`)

Text Solution

Verified by Experts

The correct Answer is:
8
Assume both blocks are accelerating towards left with acceleration a
`a = (f-2)/(2) = (20-f)/(4)` or `f = 8N`
`f_(max) = mu mg = (0.6)(2)(10) = 12N`
So frictional force `= 8N`
Promotional Banner

Topper's Solved these Questions

  • FRICTION

    NARAYNA|Exercise Passage type of questions I|6 Videos

  • FRICTION

    NARAYNA|Exercise Passage type of questions|6 Videos

  • COLLISION

    NARAYNA|Exercise Level-II (H.W)|54 Videos

  • GRAVITATION

    NARAYNA|Exercise EXERCISE -IV|40 Videos

Similar Questions

Explore conceptually related problems

Two block A and B are connected to a spring (force constant k = 480 N/m) and placed on a horizontal surface. Another block C is placed on B. The coefficient of friction between the floor and block A is mu_1 = 0.5 , whereas there is no friction between B and the floor. Coefficient of friction between C and B is mu_2 = 0.85 . Masses of the blocks are M_A = 50 kg, M_B = 28 kg and M_C = 2 kg . The system is held at rest with spring compressed by x_0 = 0.5 m . After the system is released, find the maximum speed of block B during subsequent motion.

Block A weight 20 kg placed on a smooth surface. Weight B of 2 kg is mounted on the block . The coefficient of friction between the block and the weight is 0.25 Calculate the acceleration of the block and the weightand also the frictional force between the block and the weight when a horizontal force 2 N applied to the weight as shown in fig What will these quantities be if the horizontal force is 20 N? (g = 10ms^(-2))

A block of mass 10kg is placed on a rough horizontal surface having coefficient of friction mu=0.5 . If a horizontal force of 100N is acting on it, then acceleration of the will be.

A block of mass m is placed on a rough horizontal surface. If minimum force to pull the block is (mg)/(2) then coefficient of friction is :

Block A of mass 3 kg is placed on another block B of mass 5 kg placed on the smooth surface. If coefficient of friction between two blocks is 1/2 and 32 N force is applied on block B as shown in the figure, then the work done by the frictional force on block A in first two second will be (initial velocity of the system is zero and g = 10 m/s^2 )

The ratio of acceleration of blocks A placed on smooth incline with block B placed on rough incline is 2:1 . The coefficient of kinetic friction between block B and incline is

A force of 49 N just able to move a block of wood weighing 10 kg on a rough horizontal surface , then coefficient of friction is

Block A of mass 2kg is placed over a block B of mass 8kg . The combination is placed on a rough horizontal surface. If g=10ms^(-2) , coefficient of friction between B and floor =0.5 , coefficient of friction between B and floor =0.5 , coefficient of friction between A and B=0.4 and a horizontal force of 10N is applied on 8kg block, then the force of friction between A and B is.

Block A of mass 1 kg is placed on the rough surface of block B of mass 3 kg . Block B is placed on smooth horizontal surface. Blocks are given the velocities as shown. Find net work done by the frictional force. [in (-) ve J ]. .

A block A of mass 2 kg is placed over smooth block B of mass 4 kg which is placed over a smooth horizontal floor The coefficient of friction between A and B is 0.4 when a horizontal forces of magnitude 10 N is applied on A the acceleration of block of A and B are