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It is difficult to open or close the doo...

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

Text Solution

Verified by Experts

This is because by doing so, `r = 0`, therefore torque `= rF sin theta =` Zero.
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PRADEEP-SYSTEMS OF PARTICLES AND ROTATIONAL MOTION-SHORT ANSWER QUESTIONS
  1. A body is in rotational motion. Is it necessary that a torque be actin...

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

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

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

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

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  6. What is angular impulse ?

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

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  8. Is a body in circular motion in equillibrium ?

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

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

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

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

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  13. Explain the concepts of torque and angular momentum.

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  14. Explain what is meant by centre of gravity.

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

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

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

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

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

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  20. In which of the following cases shown Fig. it is most difficult to rot...

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