Statics — Force System Classification Coplanar non-concurrent forces are those forces which ______ at one point, while their lines of action lie in the same plane.

Introduction / Context: Classifying systems of forces guides the choice of equilibrium equations and solution strategy. “Coplanar” refers to forces whose lines of action lie in a single plane; “concurrent” refers to whether those lines intersect at a common point.

Given Data / Assumptions:

• All forces are coplanar (2D).
• Their lines of action do not intersect at one point.

Concept / Approach: Coplanar concurrent forces meet at a single point. Coplanar non-concurrent forces do not all intersect at one point; they may be parallel, form a general 2D system, or intersect pairwise at different points. Such systems typically require both ΣF = 0 components and ΣM = 0 to solve.

Step-by-Step Reasoning:

Verification / Alternative check: Examples include a beam with multiple non-collinear loads and reactions. Not all lines of action intersect at one point, yet all lie in the beam’s plane.

Why Other Options Are Wrong: “Meet” defines concurrent forces; “Must be parallel only” is too restrictive (non-concurrent sets can be non-parallel); “Equal and opposite” would be a special case forming a couple.

Common Pitfalls: Confusing “non-concurrent” with “parallel”; assuming coplanar automatically implies concurrency.

Final Answer: do not meet.