Which of the following is the correct unit for measuring force in the SI system?

The correct unit for measuring force in the SI system is the Newton. This unit is defined as the force required to accelerate a mass of one kilogram at the rate of one meter per second squared. The Newton is a derived unit in the International System of Units (SI), and it incorporates the fundamental units of mass (kilograms), length (meters), and time (seconds).

In contrast, the Pascal (Pa) is a unit of pressure that measures force per unit area, thereby not representing force itself. The kilogram is a measure of mass, not force, while the Joule is a unit of energy, defined as the work done when a force of one Newton is applied over a distance of one meter. Thus, the Newton uniquely represents the measurement of force in the context of physics.