What is the SI unit of force or weight?

The SI unit of force, which is also used to denote weight, is the Newton (N). This unit is defined as the force required to accelerate a mass of one kilogram at a rate of one meter per second squared. In formulaic terms, it reflects the relationship described by Newton's second law of motion: force equals mass times acceleration (F = ma). Since weight is the force exerted by gravity on an object, it is measured in Newtons. This cohesive definition reinforces why the Newton is the standard and universally accepted unit for measuring both force and weight in the International System of Units (SI).

Other options such as the Joule, Pound, and Meter serve different purposes in the realm of measurements. The Joule measures energy, the Pound is an imperial unit of force rather than SI, and the Meter measures distance. Therefore, none of these options fulfill the requirements of the SI unit specifically designated for force or weight.