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To open or close a heavy door, why force...

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

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When `theta = 90^(@), tau = rF sin 90^(@) = rF =` maximum.
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PRADEEP-SYSTEMS OF PARTICLES AND ROTATIONAL MOTION-SHORT ANSWER QUESTIONS
  1. Why are doors provided with handles near the outer edges, far away fro...

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

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

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

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  5. What is angular impulse ?

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

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  7. Is a body in circular motion in equillibrium ?

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

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

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

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

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  12. Explain the concepts of torque and angular momentum.

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  13. Explain what is meant by centre of gravity.

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

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

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

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

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

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

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  20. In first figure a meter stick, half of which is wood and the other hal...

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