Physics Vectors & Equilibrium PMDC Conceptual Practice
PMDC Verified Question 25 of 50
Two equal and opposite forces acting on a body along different lines of action form a:
A
Resultant vector
B
Moment arm
C
Couple
D
Linear impulse
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Couple
Concept:
Definition and properties of a force couple.

Solution:
A couple is defined as two parallel forces that are equal in magnitude, opposite in direction, and do not share a common line of action. A couple produces a pure torque with zero net translational force.

Why other options are incorrect:
  • Resultant vector: The net vector sum of these two forces is actually zero, so they do not produce a net translational force.
  • Moment arm: This is a distance measurement, not a system of forces.
  • Linear impulse: This is the change in linear momentum, which is zero since the net force of a couple is zero.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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