Home
Class 11
PHYSICS
If a body is rotating, is it necessarily...

If a body is rotating, is it necessarily being acted upon by an external torque ?

Text Solution

Verified by Experts

No, torque is required only for producing angular acceleration. For uniform rotation, no torque is needed.
Promotional Banner

Topper's Solved these Questions

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    PRADEEP|Exercise CONCEPTUAL PROBLEMS II.|2 Videos

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    PRADEEP|Exercise VERY SHORT ANSWER QUESTIONS I.|2 Videos

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    PRADEEP|Exercise CONCEPTUAL PROBLEMS I.|2 Videos

  • RAY OPTICS

    PRADEEP|Exercise Problem For Practice(a)|25 Videos

  • THERMODYNAMICS

    PRADEEP|Exercise Assertion- Reason Type Questions|19 Videos

Similar Questions

Explore conceptually related problems

A body is in pure rolling on a surface. Is it necessarily being acted upon by an external torque ?

A body is acted upon by balanced forces

When a body is spinning on its axis in absence of any external torque, then choose the wrong statement

A body is in rotational motion. Is it necessary that a torque be acting on it ?

Calculate the instantaneous power of a body rotating with angular velocity of 20rad//s^(-2) , when an external torque of 5 Nm is applied to it. Hint : P=tau omega .

Assertion : Inertia is the property by virtue of which the body is unable to change by itself the state of rest only. Reason : The bodies do not change their state unless acted upon by an unbalanced external force.

A body rotating at 20rad//s is acted upon by a constant torque providing it a deceleration of 2rad//s^(2) . At what time will the body have kinetic energy same as the initial value if thhe torque continues to act?

Assertion : The speed of a whirl wind in a tornado is alarmigly high. Reason : If no external torque acts on a body, its angualr velocity remains constant.

Statement I: A body moving in a circular path is acted upon by the centripetal force. Statement II: Centripetal force acting on the body is doing work to keep it rotating in the circular path.

PRADEEP-SYSTEMS OF PARTICLES AND ROTATIONAL MOTION-CONCEPTUAL PROBLEMS
  1. Which physical quantities are expressed by the following : (i) rate ...

    Text Solution

    |

  2. Torque and work are both equal to force time distance. How do they dif...

    Text Solution

    |

  3. If a body is rotating, is it necessarily being acted upon by an extern...

    Text Solution

    |

  4. Why is the handle of a screw made wide ?

    Text Solution

    |

  5. A particle is moving along a stright line parallel to x-axis with cons...

    Text Solution

    |

  6. A particle performing uniform circular motion has angular frequency is...

    Text Solution

    |

  7. Does the moment of inertia of abody change with the speed of rotation...

    Text Solution

    |

  8. What is the advantage of a flywheel ?

    Text Solution

    |

  9. Why spokes are provided in a bicycle wheel ?

    Text Solution

    |

  10. The moment of inertia of a soild sphere about a tangent is (5)/(3)mr^(...

    Text Solution

    |

  11. Find radius of gyration of a rod of length l and mass m about an axis ...

    Text Solution

    |

  12. For a given mass and size, moment of inertia of a soild disc is smalle...

    Text Solution

    |

  13. In a fly wheel, most of the mass is concentrated at the rim ? Explain ...

    Text Solution

    |

  14. Two satellites of equal masses, which can be considered as particles a...

    Text Solution

    |

  15. How will you distinguish between a hard boiled egg and a raw egg by s...

    Text Solution

    |

  16. If earth were to shrink suddenly, what would happen to the length of t...

    Text Solution

    |

  17. If two circular disks of the weight and thickness are made from metals...

    Text Solution

    |

  18. The moments of inertia of two rotating bodies A and B are I(A) and I(B...

    Text Solution

    |

  19. If polar ice caps melt, then the time duration of one day

    Text Solution

    |

  20. If no external torque acts on a body, will its angular velocity remain...

    Text Solution

    |