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A labourer standing near the top of an o...

A labourer standing near the top of an old wooden step ladder feels unstable. Why?

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The ladder can be rotated about the point of contact of the ladder with the ground. When the labourer is at the top of the ladder, the lever arm of the force is large. Hence the turning effect on the ladder will be large.
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PREMIERS PUBLISHERS-MOTION OF SYSTEM OF PARTICLES AND BODIES-OTHER IMPORTANT QUESTIONS & ANSWER (CONCEPTUAL QUESTIONS)
  1. Why in hand driven grinding machine, handle is put near the circumfere...

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  2. Is a body in circular motion in equilibrium?

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  3. A labourer standing near the top of an old wooden step ladder feels un...

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  4. Can a body in equilibrium while in motion? If yes state an example.

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

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  6. The bottom of a ship is made heavy. Why?

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  7. Why does a boy lean towards right hand side while carrying a bag in hi...

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  8. Some heavy boxes are to be loaded along with some empty boxes on a car...

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  9. About which axis, the moment of inertia of a body is minimum?

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  10. A disc is recast into a thin walled cylinder of same radius. Which wil...

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  11. A cat is able to land on its feet after a fall. Why?

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  12. Give examples where the centre of mass coincides with the geometrical ...

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  13. Why spokes are provided in a bicycle wheel?

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  14. Two boys of the same weight sit at the opposite ends of a diameter of ...

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  15. What is the power needed to maintain uniform circular motion?

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

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  17. Why centripetal force cannot do work?

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  18. Should the centre of mass of a body necessarily lie inside the body?

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  19. Is centre of mass of reality ?

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  20. Why in hand driven grinding machine, handle is put near the circumfere...

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