Final answer:
Elastic strain refers to reversible deformation in a material due to tensile, compressive, or shear stresses and is described by moduli such as Young's modulus, depending on the type of stress.
Step-by-step explanation:
The correct answer is option Physics, and the question is aimed at a High School grade level. Elastic strain is deformation that occurs when a material is subjected to compressive, tensile, or shear stress but is able to return to its original shape when these stresses are removed.
Tensile strain takes place when forces stretch a material, resulting in an increase in length, and compressive strain occurs when forces compress a material, causing it to shorten. Shear strain, on the other hand, involves changes in shape without a change in volume.
These strains occur within the proportional limit where deformation is reversible, as described by the elastic modulus - Young's modulus for tensile and compressive stresses, the bulk modulus for volume changes under bulk stress, and the shear modulus for shear stress.
Elastic strain can result from compression, tension, or shear. In physics, elastic strain refers to the deformation of an object or medium under stress.
When an object or medium is stretched or compressed by forces acting along its length, it experiences tensile or compressive stress, resulting in elongation or contraction.
For example, when you stretch a rubber band, it experiences tensile stress and undergoes elastic strain by elongating. On the other hand, when you squeeze a sponge, it experiences compressive stress and undergoes elastic strain by condensing.
Similarly, when forces act parallel to the object's surfaces, causing it to slide or deform without changing its volume, it experiences shear stress and undergoes elastic strain.