Why from the force on both ends of the spring to pull the spring deformation will produce?

Someone asked 'with two big reverse force from springs at both ends of the spring, why the spring deformation will happen? 'Tell you what spring manufacturer. Perspective: theoretical mechanics: * do not occur for migration and distortion - — For rigid bodies ( Have no deformation management system) ; Mechanics of materials: * not occur for migration, but not necessarily not happen deformation - — For the deformation ( Management system deformation) 。 Spring is deformation, obviously not suitable for rigid body as the scientific research on the basis of theoretical mechanics target namely the * for the block ( The rigid body) Don't support. Needs to consider from the Angle of mechanics of materials: together despite to *, but will result in deformation of the spring. View 2: 'two force equilibrium does not support' for the rigid body: because when the external force on the rigid body, have no deformation of rigid body, the external force, work is not rigid body migration is not happen. You see is unchanged piece did not move, that is to say, 'not support' ( Accurate said should be a force for *) 。 And spring of rigid body, this is deformation, * although it is not easy to occur for deviation (rigid body For the moment as a particle) Upward force, but the force along the force bearing move, external force work in * ( Pay attention to work can't offset) And ductility can be converted into spring, spring deformation occurs, is also you visualize 'see' spring 'by force'. When parsing problem, don't ignore the basic theory of the available conditions, avoid by all means from the book.
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