Method of joints example 2

The video tutorial demonstrates how to apply the method of joints to solve a challenging truss problem. The goal is to find the internal force in member BC. The process begins with analyzing the geometry of the truss, followed by examining joint A to determine forces AB and AC. The tutorial then moves to joint B, where the forces BD and BC are analyzed. The calculations reveal that member BC is a zero-force member, meaning it has no internal force. The tutorial emphasizes the importance of understanding trigonometry and equilibrium equations in solving such problems.

How is the internal force in member AB calculated?

Describe the significance of finding that BC has no internal force.

What conclusion can be drawn about member BC based on the analysis?