Final answer:
Objects with different breaking points have different elastic limits, meaning they can withstand varying amounts of stress before permanently deforming or breaking. Materials behave differently in the elastic and plastic regions, ultimately reaching a stress level where they fracture and break apart.
Step-by-step explanation:
When objects have different breaking points, it means that they have different elastic limits. The breaking point, or fracture point, is the stress value at which a material can no longer hold together and breaks apart. Depending on the material's properties, the amount of stress it can withstand before breaking will vary. For example, a steel beam and a plastic rod under stress will deform and eventually break at different points due to their distinct material properties.
In the elastic zone, materials will return to their original shape once the stress is removed. However, when the stress exceeds the elastic limit, materials enter the plastic region, and they will not return to their original shape, sustaining permanent deformation. As the stress continues to increase in the plastic region, it eventually leads to the breaking point where the material fractures and can no longer be considered a single sample.
Each material has its unique stress-strain curve, which indicates how it will behave under different loads. Plasticity, elastic modulus, and the ability to absorb energy before fracturing are key concepts in understanding the breaking points of various materials.