Home
Class 11
PHYSICS
A wooden block is kept on a polished woo...

A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of `18^@` with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to `15^@`. Find the coefficients of static and kinetic friction between the block and the plank.

Text Solution

Verified by Experts

The coefficient of static friction
`mu_s=tan18^0`
and the coefficient of kinetic friction is
`mu_k=tan 15^0`
Promotional Banner

Topper's Solved these Questions

  • FRICTION

    HC VERMA|Exercise worked out Examples|10 Videos

  • FRICTION

    HC VERMA|Exercise Questions for short Answer|11 Videos

  • FLUID MECHANICS

    HC VERMA|Exercise All Questions|96 Videos

  • GRAVITATION

    HC VERMA|Exercise Exercises|39 Videos

Similar Questions

Explore conceptually related problems

A plank with a box on it at one end is gradually raised about the other end. As the angle of invlination with the horizontal reaches 30^@ , the box starts to slip and slides 4.0 m down the plank in 4.0s.The coefficients of static and kinetic friction between the box and the plank will be, respectively: .

A mass of 4kg rests on a horizontal plane the plane is gradually inclined unitl at an angle =15 with the horizontal the mass just begins to slide what is the coefficient of static friction bwtween the block and the surface

Consider the situatioin shown in figure. The system is released from rest and the block of mass 1.0 kg is found to have a speed 0.3 m/s ater it has descended thrugh a distance of 1 m. find the coefficient of kinetic friction between the block and the table.

A block of mass 2.5 kg is kept on a rough horizontal surface. It is found that the block does not slide if a horizontal force less than 15 N is applied to it. Also it is found that it takes 5 seconds to slide through the first 10 m if a horizontal force of 15 N is applied and the block is gently pushed to start the motion. Taking g=10 m/s^2 , calculate the coefficient of static and kinetic friction between the block and the surface.

See Fig. A mass of 4 kg rests on a horizontal plane. The plane is gradually inclined until at an angle theta = 15^@ with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block and the surface ?

A block of mass 2 kg rests on a plane inclined at an angle of 30^(@) with the horizontal the coefficient of friction between the block and the surface is 0.7 what will be the frictional force acting on the block

The coefficient of friction between a block and plane is (1)/(sqrt3) If the inclination of the plane gradually increases, at what angle will the object begin to slide?

HC VERMA-FRICTION-Exercises
  1. A wooden block is kept on a polished wooden plank and the inclination ...

    Text Solution

    |

  2. A body slipping on a rough horizontal plane moves wioth a deceleationo...

    Text Solution

    |

  3. A block is projected along a rough horizontal road with a speed of 10 ...

    Text Solution

    |

  4. A block of mass m is kept on a horizontal table. If the static frictio...

    Text Solution

    |

  5. A block slides down as incline of 30^@ with the horizontal. Starting ...

    Text Solution

    |

  6. Suppose the block of the previous problem is pushed down the incine wi...

    Text Solution

    |

  7. A body of mass 2 kg is lyign on rough inclined plane of inclination 3...

    Text Solution

    |

  8. A body of mass 2 kg is lying on rough inclined plane of inclination 3...

    Text Solution

    |

  9. In a children park an inclined plane is constructede with an angle of ...

    Text Solution

    |

  10. A wheel is spinning at 2 radians/second. How many seconds will it take...

    Text Solution

    |

  11. The angle between the resultant contact force and the normal force exe...

    Text Solution

    |

  12. Consider the situation shown in figure. Calculate a. the acceleration ...

    Text Solution

    |

  13. If the tension in the string in the figure. Is 16 N and the accelerati...

    Text Solution

    |

  14. The friction coefficient between the table and the block shown in figu...

    Text Solution

    |

  15. In the section 3.7.3 (Banking of road) we have not included the fricti...

    Text Solution

    |

  16. The friction coefficient bettween an athelete's shoes and the ground i...

    Text Solution

    |

  17. A car is going at a speed of 21.6 km/hr when it encounters a 12.8 m lo...

    Text Solution

    |

  18. A car starts from rest on a half kilometer long bridge. The coefficiet...

    Text Solution

    |

  19. Figure shows tow blocks in contact sliding down an inclined surface of...

    Text Solution

    |

  20. Two masses M1 and M2 are connected by a light rod and the system is sl...

    Text Solution

    |

  21. A block of mass M is kept on as rough horizontal surface. The coeffici...

    Text Solution

    |