Question

When is a body said to be perfectly elastic?

Answer 1

Elasticity:

1. A body's shape always deforms when a force is applied to it. It can be crushed, stretched, or deformed in any way. After the force is removed from the body, the elasticity of the thing is measured by its capacity to restore its shape.
2. No matter what the body is, it can be squeezed, stretched, or distorted to a certain extent. The body can be broken up after that point.
3. The elasticity of an object is graphically represented by a stress-strain curve, which depicts the relationship between stress and strain. The curve is nonlinear in general, but with sufficiently tiny deformations, it can be approximated as linear.

According to Hooke's law:

1. According to Hooke's law, the force necessary to distort an elastic object should be directly proportional to the measure or distance of deformation, no matter how long that distance becomes. This is known as perfect elasticity, which means that no matter how strongly an object is deformed, it will return to its original shape.
2. It indicates that if the body is perfectly elastic, it will be able to resume its former shape and proportions.

Hence, a body is said to be perfectly elastic if it recovers its original shape/size when the deforming force is removed.