Mechanical Properties Chapter 8 Quiz

When a solid body is deformed by an applied force and does not return to its original shape and size after the force is removed, it is called plastic deformation. This type of deformation is permanent.

Hooke's law describes the linear relationship between stress (force per unit area) and strain (change in length) for an elastic material. It states that stress is directly proportional to strain within the elastic limit.

Plasticity is the ability of a material to undergo permanent deformation without breaking. Putty and mud exhibit plasticity because they can be molded and retain their shape.

In engineering design, knowledge of the elastic properties of materials is crucial for designing structures like airplanes. Elasticity allows these structures to withstand forces and return to their original shape.

Tensile stress is the restoring force per unit area acting on a body when it is subjected to a deforming force, specifically a force that tends to stretch or elongate the body.

The SI unit of stress is Pascal (Pa). One Pascal is equal to one Newton per square meter (N/m²).

Longitudinal strain is the change in length per unit original length of a body when subjected to an external force. It is a measure of how much an object stretches or compresses in response to a tensile or compressive load.