Two equal, anti-parallel, and nonconcurrent forces are:
Correct answer: A. Couple
- A. Couple
- B. Couple arm
- C. Collinear forces
- D. Torque
Explanation
The correct answer is a Couple. A couple consists of two equal, anti-parallel, and nonconcurrent forces that act to produce a rotational effect, resulting in angular acceleration without causing the object to translate. This is distinct from collinear forces, which lie along the same line and do not produce rotation. 'Couple arm' refers to the distance between the lines of action of these forces, not the forces themselves. Torque, while related to rotational motion, refers to the measure of force that causes rotation about an axis and doesn't specifically describe the scenario of the two forces mentioned.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Addition of Vectors
Vector addition combines directed quantities using the head-to-tail, parallelogram and component methods. Work includes finding the resultant magnitude and direction for two or more vectors, resolving vectors into perpendicular components, and distinguishing vector addition from scalar addition, where direction has no role.
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