How is torque defined in terms of measurement?

Torque is defined as a measure of the twisting force that causes rotation around an axis. It is a critical concept in mechanics and engineering, as it quantifies the effectiveness of a force in producing rotational motion. When a force is applied at a distance from an axis or pivot point, it generates torque, which is calculated as the product of the force and the distance from the pivot (often referred to as the moment arm).

Understanding torque is essential in various applications, such as designing engines, bicycles, and machinery where rotation is involved. The other choices focus on different types of forces that do not contribute to the concept of rotation. A force expressed in pounds simply refers to a linear force, while a linear force itself does not take into account the rotational aspect of motion, and pressure force relates to force distributed over an area, not rotational dynamics. Thus, defining torque as a twisting force accurately encapsulates its role in inducing rotation and allows for effective application in engineering practices.