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Elasticity- Online Physics Notes for Class 11 Class 11 Physics: Elasticity is that property of a body by that it experiences a amendment in size or form whenever a deforming force acts on the body. once the force is removed the body returns to its original size and form. the general public square measure aware of the stretching of a elastic device. All materials, however, have this same elastic property, however in most materials, it's not therefore pronounced. the reason of the elastic property of solids is found in AN atomic description of a solid. Most solids square measure composed of a really sizable amount of atoms or molecules organized in an exceedingly mounted pattern referred to as the lattice structure of a solid. Lattice structure of solid. These atoms or molecules area unit command in their positions by electrical forces. The electrical force between the molecules is enticing and tends to tug the molecules along. Thus, the solid resist being force apart.