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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.

Text Solution

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When `theta = 90^(@), tau = rF sin 90^(@) = rF =` maximum.
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To push open a door, a person applies a force of 75 N on the handle of the door, at an angle of 60^(@) from the normal to its plane. If the handle is located at a distance of 80 cm from its hinge, find the torque applied by him.

Explain why a door cannot be opened when force is applied at the hinges.

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.

  • He opens the door.

    A
    The door is opened by him.
    B
    The door was opened by him.
    C
    The door shall be opened by him.
    D
    The door will be opened by him.

  • 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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    A : It is very difficult to open or close a door if force is applied near the hinge. R : The moment of applied force is minimum near the hinge.

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    A door 1.6 m wide requires a force of 1N to be applied at the free and to open or close it. The force that is required at a point 0.4 m distance from the hinges for o[ening or closing the door is

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