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A hinge pin is then placed through the two sets of knuckles and usually fixed, to combine the plates and make the hinge a single unit. One door usually has about three hinges, but it can vary.
The principle of moments is utilised while tightening a nut using a spanner or a wrench.
A kind of a pressure is known as thrust which is acted for one unit area of a circumference. The formula is P=F/A. As per this formula pressure is inversely proportional to the area. This pressure can be enhanced as per force caused by lowering area.
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