Home
Class 11
PHYSICS
force F = 100 N is applied horizontally ...

force F = 100 N is applied horizontally on a block of mass 4 kg. Which is in contact with a wall. Such that it does not fall. The coefficient of friction between the block and the wall is

A

0.8

B

0.5

C

0.4

D

0.3

Text Solution

Verified by Experts

The correct Answer is:
A
`N= mu_(s )F`
`mu_(s ) = (N )/( F ) = (mg )/(F ) = (4xx 10)/( 100) = 0.4`
Promotional Banner

Topper's Solved these Questions

  • LAW OF MOTION

    KUMAR PRAKASHAN|Exercise SECTION-F (QUESTIONS FROM MODULE)|22 Videos

  • LAW OF MOTION

    KUMAR PRAKASHAN|Exercise (QUESTION PAPER) SECTION-A|5 Videos

  • LAW OF MOTION

    KUMAR PRAKASHAN|Exercise SECTION-D(NCERT EXEMPLAR SOLUTIONS)|42 Videos

  • GRAVITATION

    KUMAR PRAKASHAN|Exercise QUESTIONS PAPER Section - D|1 Videos

  • MACHANICAL PROPERTIES OF SOLIDS

    KUMAR PRAKASHAN|Exercise QUESTION PAPER|11 Videos

Similar Questions

Explore conceptually related problems

What is the value of the force vecF to be applied horizontally on a block of mass 5 kg which is in contact with a wall, as shown in the figure. (Take g = 10 m//s^(2) ) such that it does not fall down. The coefficient of friction between the block and the wall is 0.4.

A horizontal force of 10N is necessary to just hold a block stationary against as well. The coefficient of friction between the block and the wall is 0.2. The weight of the block is

A plank of mass 2 kg and length 1 m is placed on horizontal floor.A small block of mass 1 kg is placed on top of the plank , at its right extreme end .The coefficient of friction between plank and floor is 0.5 and that between plank and block is 0.2 . If a horizontal force = 30 N starts acting on the plank to the right ,the time after which the block will fall off the plank is (g = 10 ms^(-2))

Two bodies A and B of masses 5 kg and 10 kg in contact with each other rest on a table against a rigid wall as shown in figure. The coefficient of friction between the bodies and the table is 0.15. A force of 200 N is applied horizontally to A. What are (a) the reaction of the partition, (b) The action-reaction forces between A and B ? What happens when the wall is removed ? Does the answer to (b) change, when the bodies are in motion ? Ignore the difference between p_(s) and p_(k) .

A bullet of mass 50g moving with velocity 600m//s hits block of mass 1.0kg placed on a rough horizontal ground and comes out of the block with a velocity of 400m//s . The coefficient of friction between the block and the ground is 0.25 . Neglect loss of mass of the block as the bullet pierces through it. (a) In spite of the fact that friction acts a an external force, can you apply principle of conservation of momentum during interaction of the ullet with the block? (b) Find velocity of the block immediately after the bullet pierces through it. (c)FInd the distance the block will travel before it stops.

Block of mass 10 kg is moving on inclined plane with constant velocity 10 m/s. The coedfficient of kinetic friction between incline plane and block is :-

Find the minimum value of horizontal force (F) required on the block of mass m to keep it at rest on the wall. Given the coefficient of friction between the surfaces is mu .

A force of 100 N is applied on a block of mass 3kg as shown below. The coefficient of friction between wall and the block is 1//4 . The friction force acting on the block is :

A block A with mass 100kg is resting on another block B of mass 200kg. As shown in figure a horizontal rope tied to a wall hold it. The coefficient of friction between A and B is 0.2 while coefficient of friction between B and the ground is 0.3 . the minimum required force F to start moving B will be.

A horizontal force of 10N is necessary to just hold a block stationary against a wall. The coefficient of fricition between the block and the wall is 0.2 then find the weight of the block. (g=10m//s^(2))

KUMAR PRAKASHAN-LAW OF MOTION-SECTION -E(MULTIPLE CHOICE QUESTIONS) (MCQS)
  1. If P, v and E denotes the momentum, velocity and K.E. of a particle th...

    Text Solution

    |

  2. A block (A) of mass 20 kg is put on a frictionless surface and another...

    Text Solution

    |

  3. force F = 100 N is applied horizontally on a block of mass 4 kg. Which...

    Text Solution

    |

  4. The SI unit of time rate of change of momentum is ………..

    Text Solution

    |

  5. A stationary bomb explodes into three fragments. If the linear momentu...

    Text Solution

    |

  6. The linear momentum of a particle at time t is given by the equation P...

    Text Solution

    |

  7. If linear momentum of a body is increased by 0.5% its kinetic energy i...

    Text Solution

    |

  8. F rarr t graph for a body is shown in figure. The change in value of ...

    Text Solution

    |

  9. When a force acts on a body of mass 200 gram the change in its velocit...

    Text Solution

    |

  10. A car of mass 1000 kg is moving with a velocity 20m /s on a horizontal...

    Text Solution

    |

  11. The value of co-efficient of static friction (mu(s)) is in the range b...

    Text Solution

    |

  12. A force acts on an object of mass 2 kg at rest, for 0.5 s. After the f...

    Text Solution

    |

  13. A person of mass 60 kg is standing on a raft of mass 40 kg in a lake. ...

    Text Solution

    |

  14. A block of 50 kg on a smooth plane inclined at 60^(@) and another bloc...

    Text Solution

    |

  15. If the speed of a vehicle become 3 times for a given deceleration its ...

    Text Solution

    |

  16. If vectors are vecA = 2 hati + 3 hatJ - hatk and hatB = 4 hati + 6 hat...

    Text Solution

    |

  17. vecA = 2 hati +3 hatJ +4 hatk and vecB =4 hati +5 hatj +3 hatk , then ...

    Text Solution

    |

  18. Find the vector product of vectors vecA = 4hati + 2 hatJ - hatk ,vecB ...

    Text Solution

    |

  19. A body of mass 20 kg at one end and another of 60 kg at the other end ...

    Text Solution

    |

  20. If vector vecA =4 hati -6 hatJ +2hatk and vecB =6hati +8 hatj +mhatk a...

    Text Solution

    |