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a ball that you use when you are bad or unhappy
Metal when it gets hit, stays dented and looks terrible. Plastic either breaks or bounces back to original shape, thus defeating vandals' efforts. Plastics are probably cheaper to produ
Elastic can be stretched and then reverts back to its original shape.
Torsion strength measures the largest torsion force the material can withstand and still spring back into its original shape.
The "elastic portion" is precisely the part where the material returns to its original shape, and thus returns its energy. Once the material does NOT return to its previous shape, it doesn't exert a force back to the original position, and there is no way to get the energy back.
Elastic is something that can be stretched but goes back to its original shape after.
That would be a spring, which is stretched when you apply force to it. The spring used have a specific force constant, which means that an extension of the spring to a certain length is equal to a fixed amount of force.
Materials that bounce back to shape after the force applied is stopped are called Elastic Materials.
It can revert back to its original shape.
WaTer
They are called smart shaped memory alloys they go back to their original shape when heated
When external force acts on a body ,the change in the shape and size of a body is determined by the force between its atoms or molecules.This short range atomic force are called elastic force .A body is said to be perfectly elastic, if it recovers original size and shape when the external force are removed. And , it does not mean "How flexible your body is".