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We cannot open or close the door by appl...

We cannot open or close the door by applying force at the hinges. Why?

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To open or close a door, we apply a force normal to the door. If the force is applied at the hinges the perpendicular distance of force is zero. Hence, there will be no turning effect however large force is applied.
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VGS PUBLICATION-BRILLIANT-SYSTEM OF PARTICLES AND ROTATIONAL MOTION -PROBLEMS
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