Physics
Bandish and Parag, on a trek to Sandakpu, halted at a tea house in Tumbling. The picture above shows the entrance door of the tea house. They saw the tumbrel filled with water hanging from top rigid support passing through the door. On enquiring about the tumbrel, the owner of the tea house, he said that it acts as a pullback (door closure) after opening and releasing the door.
(a) Explain how the tumbrel helps to close the door on its own.
(b) Name the principle involved.
Force
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Answer
(a) Initially, the center of gravity of the tumbrel is vertically below the fixed support, so the torque on the door is zero as the torque arm is zero.
But when we push the door to open it, the tumbrel moves away and now there is some torque arm which acts on the door to bring it back to its original position.
(b) Principle of moments.
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