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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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Knowledge Check

  • Close the doors.

    A
    Let the doors are closed.
    B
    The doors are to be closed.
    C
    Let the doors be closed.
    D
    Allow the doors to close.

  • Please close the door.

    A
    You please close the door.
    B
    You close the door yourself.
    C
    Let the door be closed by you.
    D
    Please be the door closed by you.

  • Open the door.

    A
    The door must be opened.
    B
    The door will be opened.
    C
    The door is opened.
    D
    Let the door Be opened.

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