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Sian Jones 11BGC Aim: To investigate the behaviour of an elastic material when a tensile force is applied. What I know: In the 1660s Robert Hooke investigated how springs and wires stretched when loads were applied. He found out that for many materials, the extension and load were in proportion provided the elastic limit was not exceeded. Materials can be compressed as well as stretched. If a material is stretched but springs back to its original shape they are known as elastic. However they stop being elastic if bent or stretched too far. They either break or become permanently deformed. The springs represent the bonds caused by the forces of attraction and repulsion between the atoms, due to the electric charges of their nuclei and electrons. The attractive forces between the molecules in a solid provide its characteristic elastic or stretchy properties. When we stretch a solid, we are slightly increasing...

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