In the metric system, force is expressed in what unit?

In the metric system, force is expressed in newtons. The newton is the standard unit of force in the International System of Units (SI), which is widely used in scientific and engineering disciplines. One newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared. This relationship between mass and acceleration is a key principle in physics, specifically described by Newton's second law of motion.

Other options represent units that are not used to express force in the metric system. Pounds, for example, are used in the imperial system to measure force but do not relate to the metric measurements. Kilograms and grams, while they are units of mass in the metric system, do not convey the concept of force on their own without the contextual relationship of acceleration. Thus, newtons are the appropriate and standardized unit for stating force in metric measurements.