Couple

Where a pair of forces of equal magnitude acting in parallel but opposite directions are capable of causing rotation.

Purpose

A couple is essential in mechanical engineering and physics for creating rotational motion without translational movement. Understanding couples helps in the design of various mechanical systems and structures, ensuring proper functionality and stability.

Examples of Use

1. In a steering wheel, a couple is applied when equal forces are exerted by hands in opposite directions to turn the wheel.
2. In the design of torque wrenches, a couple is used to apply a precise rotational force to tighten bolts and nuts.
3. In robotics, couples are utilized to control the rotation of joints and appendages.

Related Terms

• Torque: A measure of the rotational force applied by a couple.
• Moment of Force: The tendency of a force to cause rotation about a point or axis.
• Equilibrium: A state where the sum of forces and moments on a system is zero, resulting in no motion.

Notes

Couples are often used in mechanical systems to induce rotational motion without causing linear displacement. Proper understanding and application of couples are crucial in engineering design to ensure mechanical efficiency and safety.