Answer to Question #259290 in Mechanics | Relativity for Mst. Ohida Khatun

Question

Miss Y agreed to keep a request from her friend to cook rice in an aluminium pot. A metal cover was used on the top of the aluminium pot during cooking, but after a short-while the metal cover was fallen down. They involved in a debate to explain it using a theorem of physics why the metal cover has been fallen down from the top of the aluminium pot. Miss Y said that it was due to produced pressure but her friend agreed on it to some extent and also asked about the conversion of energy, demanding to show the expression for the theorem. Could please help Miss Y?

Answer 1

The pressure inside created a force, which is proportional to the product of pressure and the surface area of the cover. The force became greater than the force of gravity of the cover and it fell down (Newton's second law: non-zero net force causes accelerated motion). While moving down, it followed conservation of energy: the potential energy was used to move the cover down while it was falling.