Stress in a solid body is defined as internal forces developed due to externally applied forces per unit area. This means that when an external force is applied to a solid body, it creates internal forces within the body that resist the external force. Stress is a measure of these internal forces per unit area.

Explanation:

Stress is a fundamental concept in mechanics and is defined as the internal forces developed within a solid body due to externally applied forces. These internal forces are distributed over the area of the body and are measured in units of force per unit area, such as Pascals (Pa) or Newtons per square meter (N/m2).

The concept of stress is important in engineering and physics because it helps us understand the behavior of solid bodies when subjected to external forces. By calculating the stress in a body, we can predict how it will deform or break under various loading conditions.

Types of Stress:

There are different types of stress that may be experienced by a solid body, depending on the nature of the external forces applied. Some of the commonly encountered types of stress include:

1. Tensile stress: This is the stress that develops in a body when it is subjected to an external force that tends to stretch or pull it apart.

2. Compressive stress: This is the stress that develops in a body when it is subjected to an external force that tends to compress or push it together.

3. Shear stress: This is the stress that develops in a body when it is subjected to an external force that tends to cause one part of the body to slide or move relative to another part.

Conclusion:

In conclusion, stress in a solid body is defined as internal forces developed due to externally applied forces per unit area. By understanding the concept of stress and its different types, we can better predict the behavior of solid bodies under various loading conditions and design structures that can withstand these forces.