Question

each joint in a planar truss constitutes a complete concurrent force system that must be in equilibrium.
true
false

Explanation:

In a planar truss, each joint has forces from the truss members (and possibly external loads) acting on it. A concurrent force system means all forces act through a common point (the joint). For a truss in static equilibrium, each joint must also be in equilibrium (sum of forces in x and y directions is zero, sum of moments is zero for concurrent systems, though moments about the joint are zero as forces pass through it). So the statement is true.

Answer:

True (the option: True)