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A body is in rotational motion. Is it ne...

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

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No. torque is required only for producing angular acceleration.
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PRADEEP-SYSTEMS OF PARTICLES AND ROTATIONAL MOTION-SHORT ANSWER QUESTIONS
  1. What is the dimensional formula of angular momentum and what are its u...

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  2. Is the angular speed of rotation of hour hand of a watch greater or sm...

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  3. A body is in rotational motion. Is it necessary that a torque be actin...

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  4. Why are doors provided with handles near the outer edges, far away fro...

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  5. It is difficult to open or close the door by pushing/pulling it at the...

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  6. To open or close a heavy door, why force is applied at right angles to...

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  7. Why is it easier to open a tap with two fingers than with onw finger ?

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  8. What is angular impulse ?

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  9. Which component of linear momentum does not contribute to angular mome...

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  10. Is a body in circular motion in equillibrium ?

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  11. A particle moves in a circular path with decreasing speed. What happen...

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  12. Explain that torque is only due to transverse component of force. Radi...

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  13. Show that centre of mass of an isolated system moves with a uniform ve...

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  14. Locate the centre of mass of uniform triangular lamina and a uniform c...

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  15. Explain the concepts of torque and angular momentum.

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  16. Explain what is meant by centre of gravity.

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  17. About what axis would a uniform cube have its minimum moment of inerti...

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  18. Is radius of gyration of a body constant quantity ?

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  19. Speed of rotation of a body affects the radius of gyration of the body...

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  20. A solid disc is recast into a thin walled cylinder of same radus. Whic...

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