What is the unit of force in the International System of Units (SI)?

The unit of force in the International System of Units (SI) is the Newton. A Newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared. This relationship is encapsulated in Newton's second law of motion, which states that force equals mass times acceleration (F = ma).

In contrast, the Joule is a unit of energy, the Pound is a unit of force used in the Imperial system, and the Pascal is a unit of pressure, defined as one Newton per square meter. Understanding the specific roles of these units helps clarify why the Newton is the appropriate choice for measuring force within the SI framework.