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We can not need to apply the force an al...

We can not need to apply the force an all particles of door for opening or closing it. Why?

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Because, the relative positive remains constant for all the particles of door is considered as a rigid body and force applies to a single particle, produces the torque acting to whole door.
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KUMAR PRAKASHAN-SYSTEMS OF PARTICLES AND ROTATIONAL MOTION-SECTION-C OBJECTIVE QUESTIONS (VSQs)
  1. To tighten the bolt, we prefer to use a wrench with a long arm why?

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  2. Handle of the door is always kept on other side (far side) of the hing...

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  3. We can not need to apply the force an all particles of door for openin...

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  4. What is the magnitude of torque for a body circulating with constant a...

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  5. Can a body have the momentum if it moves along a straight path?

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  6. If we change the axis of rotation does the magnitude of angular moment...

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  7. Any rigid body can have more than one value of moment of inertia?

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  8. What is physical quantity of the unit Joule xx" second"^(2)?

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  9. When does the magnitude of angular momentum will be zero?

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  10. Write the dimensional formula of ("Angular momentum")/("Linear momen...

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  11. If the ice in the polar caps of earth melts, how will it affect angula...

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  12. Write the necessary condition for solid cylinder rolling down without ...

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  13. Can we use v=romega for a body rolling without sliding?

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  14. What is radius of gyration? Write its unit and dimensional formula.

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  15. The angular velocity of a particle rotates with constant speed on only...

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  16. Is the linear velocity of a particle moving with constant angular spee...

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  17. Write formula of vector form for the angular velocity and linear veloc...

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  18. Which component of linear acceleration of a particle moving in a const...

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  19. Is the tangential acceleration of a particle moving along a fixed circ...

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  20. Write the difference between sound wave and light waves.

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