What type of force is applied to the bottom cord of a truss?

The correct answer identifies that the bottom cord of a truss experiences tension. In a truss system, the bottom cord, also known as the tension member, is designed to resist forces that pull it apart. When a load is applied to the truss, the structure distributes the weight across its members; this often creates a situation where the bottom cord is stretched as it supports loads and transmits forces, especially under scenarios of vertical loads or when the structure is subjected to varying stresses.

In contrast, the top cord of the truss typically undergoes compression, which occurs when forces push inward. The distinction between these forces is crucial for understanding truss design and its overall structural integrity. Bending and shear forces are applied in different contexts and typically do not describe the primary forces acting on the bottom cord. The primary function of the bottom cord is to manage tension forces, making it vital for maintaining the stability and efficiency of the truss structure.