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Torque is a crucial concept in mechanics that refers specifically to the rotational force applied to an object around a pivot point or axis. It quantifies the tendency of a force to produce or change the rotational motion of an object, making it fundamental in various applications like engines, machinery, and tools.

When a force is applied at a distance from a pivot point, it creates a twisting effect or moment, which is what torque measures. The effectiveness of this force in causing rotation is dependent not only on the magnitude of the force but also on the distance from the pivot point to where the force is applied; this is known as the lever arm.

Understanding torque is essential for designing and analyzing mechanical systems, as it influences how efficiently a system can operate and how loads are distributed across components. In contrast, other options such as measuring linear motion, resistance to motion, or energy consumption do not capture the essence of torque's role in rotational dynamics.