What is the unit of torque in the SI system?

In the SI system, torque is measured in newton-meters (N·m). This unit is derived from the force applied (in newtons) multiplied by the distance from the pivot point (in meters). Torque is a measure of the rotational force around an axis, so the combination of these two factors gives us a complete representation of how force can cause an object to rotate.

To further clarify, newtons represent the unit of force, while meters concern the distance at which that force is applied. Thus, when a force is applied at some distance from a pivot point, the product of these two quantities defines torque.

Other options like newton, pound, and joule represent different concepts in physics. For example, a newton is a measure of force, a pound is also a measure of force but in a different system (imperial), and a joule is a unit of energy, not of torque. Therefore, the combination of newtons and meters to form newton-meters is the correct representation of torque in the SI system.