Which of the following is an accurate unit of measurement for torque?

Torque is a measure of the rotational force applied at a distance from an axis of rotation. The formula for torque (τ) is given by the equation τ = r × F, where r is the distance from the axis of rotation to the point of force application (lever arm) and F is the force applied.

The unit of force in the International System of Units (SI) is the Newton (N), and the unit of distance is the meter (m). Consequently, when calculating torque, the unit becomes Newton-meter (Nm), which directly represents the measurable rotational effect produced by a force applied at a distance.

This understanding reinforces the accuracy of the selected unit, as torque requires both a force component and a distance component, making Nm the appropriate and standard unit of measurement. The other units provided do not accurately represent torque due to their dimensions not aligning with the fundamental nature of the torque equation. For instance, Nm^2 and kgm^2 incorporate additional dimensions that are not relevant to torque, and kgm does not account for force. Therefore, Nm as a unit of measurement for torque distinctly reflects what torque represents in biomechanical contexts.