Why we feel jump on sofa when we sit.
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This is the force that you apply to the seat of your chair. ... Because of this, the force of gravity pulling you down is countered by the force of the chair pushing you up, and you do not go sprawling all over the floor. This is a hard concept, because it always applies, even when you might think it does not.
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It is due to thew vacuum present inside foam by which the sofa is made up of. The pores of the foams carry air and when we apply pressure on it then the air comes out and we feel like jumping.
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